2026-07-12 · shift work, circadian, night shift, sleep, weight loss, metabolic health · 21 min read

How much weight can shift workers realistically lose?

0.5 to 1 pound per week is a fair honest target for most shift workers on a well-executed plan — the same range as day workers at matched calorie deficits, but with a wider week-to-week variance because sleep debt on the front and back of a stretch of shifts drives water shifts, appetite spikes, and stress-eating episodes. Wang 2011 (Occupational and Environmental Medicine) meta-analyzed the shift-work-and-obesity literature and estimated a modest but real independent BMI penalty of roughly 0.5 to 1.5 kg/m² attributable to shift schedules holding calories constant. Translation: your rate of loss is not slower than a day worker's, but the schedule fights you at the margin, so 8 to 20 pounds over a year is a realistic, defensible expectation for a shift worker who nails the protein-anchored pre-shift meal, keeps a 10-14 hour eating window, and protects day-sleep with a blackout bedroom. Faster is possible on a GLP-1 or bariatric-surgery track; slower is common when the sleep side is unmanaged.

What should a night-shift worker eat at 3 a.m.?

The best 3 a.m. meal on night shift is protein-anchored (25 to 35 g), moderate-carb (about 30 to 45 g of slower-releasing sources like beans, oats, or whole-grain wraps), and under about 600 kcal — enough to hold energy for the second half of the shift without the glucose spike-and-crash that hits hard when you are melatonin-elevated. The five templates in the section below (Greek-yogurt bowl, turkey-avocado wrap, lentil soup with a cheese stick, hard-boiled eggs with hummus and veg, salmon-and-rice reheat) all fit that shape. Avoid the vending machine bag-of-chips-and-soda combo; overnight glucose intolerance is real (Morris 2015; Morris 2016) and simple carbs eaten during the biological night hit the bloodstream harder than the same meal at noon. The 3 a.m. meal is not optional — skipping it usually just moves the calories to a chaotic post-shift binge at 8 a.m.

When should I take my main meal on night shift?

Anchor the main meal to activity start, not calendar time. If your shift is 7 p.m. to 7 a.m., eat a real, larger meal roughly 3 hours before shift start (around 4 p.m.) so digestion has time before you clock in. That is your 'lunch' on night-worker time. Then a lighter protein-anchored meal (300 to 500 kcal) about halfway through the shift, and a small pre-sleep snack (yogurt, cottage cheese, or a piece of fruit with nut butter) if you are truly hungry when you get home. The rule from the meal-timing and chrononutrition literature is simple: front-load calories toward the beginning of your active period, taper toward the end, and stop meaningful eating 2 to 3 hours before your planned sleep. See our meal-timing chrononutrition guide for the wider chrono-appetite mechanics — the pattern is the same, just phase-shifted.

Do intermittent fasting protocols work for night-shift workers?

Yes, with a shift-worker translation. The evidence for 10-hour time-restricted eating (TRE) in shift workers is the Manoogian 2022 Cell Metabolism study of 137 San Diego firefighters, which showed a 10-hour window improved cardiometabolic markers with high adherence over 12 weeks. The critical rule is that the eating window is anchored to activity start, not to the calendar day: for a 7 p.m.-to-7 a.m. shift, a 10-hour window might run 3 p.m. to 1 a.m., not 9 a.m. to 7 p.m. Full IF protocols like 16:8 and 5:2 also work but are harder to sustain across a rotating schedule where the activity start moves. Avoid true fasting on days you cannot sleep well — the ghrelin rebound after a bad day-sleep will blow through the window.

Is coffee bad for weight loss on shift work?

Moderate coffee (2 to 4 cups over the first two-thirds of the shift) is fine and can help alertness and even total daily energy expenditure at the margin. The real trap is caffeine timing against day-sleep. Caffeine has a half-life of about 5 hours and a quarter-life of about 10, so a 4 a.m. coffee is still measurably suppressing sleep drive when you get home at 8 a.m. — day-sleep quality collapses, cortisol stays high, ghrelin rebounds, and the next-shift appetite spike is worse. The workable rule is a hard caffeine cutoff about 6 hours before your target sleep start; on a 7 a.m. end-of-shift, that means no caffeine after roughly 1 a.m. See our [coffee, caffeine, and weight loss](/weight-loss/coffee-caffeine-weight-loss/) page for the wider dose-response picture.

How do I lose weight on rotating shifts?

Rotating shifts are the hardest schedule for weight control because the circadian misalignment is chronic and the eating window keeps moving. The workable approach is to lock the *pattern* even when the clock time slides: protein-anchored pre-shift meal 2-3 hours before start, one mid-shift meal, no simple-carb vending-machine intake, hard caffeine cutoff 6 hours before target sleep, and one 10-14 hour eating window anchored to activity start. On changeover days (day-to-night or night-to-day), accept that one 24-hour block will be higher-calorie and more disordered than the rest — plan around it, do not moralize about it. Keep the total-week deficit modest (400-500 kcal/day) rather than aggressive, because a 750-1,000 kcal deficit compounded onto a bad day-sleep is a binge waiting to happen.

Are GLP-1 medications safer or less effective for shift workers?

No RCT has powered a shift-worker subgroup analysis for semaglutide or tirzepatide, so the honest answer is: probably similarly effective, with two practical cautions. First, GLP-1 nausea can be worse when superimposed on sleep debt — dose escalation is often smoother during a stretch of days off. Second, GLP-1 satiety can make it easy to under-eat protein inside a compressed shift-worker eating window, and low protein plus sleep-loss-driven muscle-protein-breakdown is a lean-mass-loss setup. Aim for 1.2 to 1.6 g/kg body weight of protein spread across the eating window, keep resistance training in the plan at least twice a week (see the sarcopenic obesity guide), and coordinate insulin or sulfonylurea adjustments with your prescriber if you are on those. The GLP-1 does not fix the schedule.

Should I take melatonin as a shift worker?

Sometimes, and in a lower dose than most people take. The evidence base (Buscemi 2005 BMJ meta-analysis; AASM shift-work sleep disorder guidance) supports 0.3 to 0.5 mg taken 30 to 60 minutes before your intended day-sleep start, not the 3 to 10 mg gummy dose sold in most drugstores. Higher doses do not sleep-shift better and can leave a next-shift grogginess that fragments the following night's schedule. Melatonin is a circadian phase-shifter, not a sedative — it works best on a permanent night shift or a stable rotating pattern where the phase shift you are trying to induce is consistent. For a rotating schedule that changes every 3 to 4 days, melatonin is less useful than fixing the light exposure at wake and blocking light at target sleep. Talk to your prescriber before adding any nightly agent.

Shift Work and Weight Loss: How to Eat, Train, and Sleep on Night, Rotating, and 12-Hour Shifts

Quick answer: Shift work does not make weight loss impossible — it makes it harder at the edges, and it needs a plan built around your activity start rather than the calendar day. The workable stack is: a protein-anchored meal 2-3 hours before shift start, one 10-14 hour eating window anchored to when you clock in (not to sunrise), a mid-shift meal that leans protein and moderate-carb, a hard caffeine cutoff about 6 hours before target sleep, a blackout-bedroom day-sleep protocol, and one 30-45 minute training session between wake and shift start with resistance work at least twice a week. Realistic loss is 0.5-1 pound per week, or 8-20 pounds over a year, matched to a day worker’s rate but with a wider variance because sleep debt distorts appetite. The evidence base — Scheer 2009, Morris 2015 and 2016, Spiegel 2004, Manoogian 2022, Vetter 2016 and 2018, Pan 2011 — is honest that the schedule is a real independent metabolic-health risk factor, not a moral failure.

Who this is for — and not for

Good fit if: you work nights, rotating shifts, 12-hour blocks, 24-hour on-call, or a compressed schedule (14-on/14-off, oilfield, ambulance, ICU nursing, DOT trucking, medical residency, rotating manufacturing), and you want weight loss that survives contact with a schedule that fights it. Also a fit if you are on a stable permanent night schedule and want to lose weight without wrecking day-sleep, or you are on GLP-1 therapy and need to make a compressed eating window work across shifts.

Not a fit if: you have untreated obstructive sleep apnea and have not started CPAP or evaluation yet — that is upstream of any weight-loss plan on shift work, and it is the single most common missed diagnosis in this population (see our sleep apnea and weight loss guide). Also not the right starting point if you are in active mood-disorder crisis, have thoughts of self-harm, or have amnestic nocturnal eating (which is Sleep-Related Eating Disorder, not shift-work eating) — those need clinical care first (988 in the US for suicide and crisis, 1-800-931-2237 for the NEDA eating-disorders helpline).

The 4 mechanisms — why shift work makes weight loss harder

Shift work is not one problem, it is four physiological problems stacked on top of one another. Each has its own evidence base, and the treatment plan targets each.

1. Circadian misalignment reduces overnight glucose tolerance

Scheer 2009 in PNAS is the landmark. Ten healthy adults on a forced 28-hour day (a lab model of shift work) developed measurably worse glucose tolerance, higher postprandial glucose, and higher blood pressure when eating and sleeping at biological-night times, holding calories constant. Morris 2015 in the Journal of Clinical Endocrinology and Metabolism extended the finding with a within-subject design showing endogenous circadian misalignment independently blunted glucose tolerance by roughly 6% and reduced insulin sensitivity — a “12-hour” meal produced a bigger glucose excursion than an “8 a.m.” meal in the same person. Morris 2016 in Current Biology localized part of the mechanism to melatonin: eating in the presence of elevated melatonin (i.e., during the biological night) worsened insulin sensitivity independent of clock time. That is why night-shift workers eating a mid-shift meal at 3 a.m. are not metabolically the same as a day worker eating lunch at 12 p.m. — the same calories hit differently.

2. Sleep debt raises ghrelin, lowers leptin, and adds about 300 kcal/day

Spiegel 2004 in Annals of Internal Medicine is the appetite-hormone paper to cite. Two nights of 4-hour sleep raised ghrelin by ~28%, lowered leptin by ~18%, and shifted rated appetite toward energy-dense, high-carb foods. Taheri 2004 in PLOS Medicine replicated the leptin-and-ghrelin signal in a much larger cross-sectional cohort and tied habitual short sleep to higher BMI. Nedeltcheva 2010 in Annals of Internal Medicine then closed the loop on body composition: adults on a matched calorie-deficit diet who slept 5.5 hours vs. 8.5 hours lost the same total weight, but the short-sleep group lost more lean mass and less fat mass, and reported hungrier days. Extrapolated across a shift-work career, that is roughly a 200 to 300 kcal/day appetite drift on the days after a bad day-sleep — enough to erase a moderate deficit if the plan does not account for it. The full appetite-hormone mechanism sits in our leptin, ghrelin, and appetite hormones guide, and the broader sleep-and-stress recovery-side lever lives in sleep, stress, and weight management. Insomnia specifically compounds the picture; see our insomnia and weight loss protocol for the CBT-I sleep-side lever.

3. Melatonin-elevated eating impairs insulin sensitivity

Morris 2016 (above) is the mechanistic paper. Eating during the biological night — when circulating melatonin is high — worsens insulin sensitivity. This is why the same 3 a.m. meal that would be metabolically neutral if eaten in the daytime provokes a bigger glucose spike on night shift. The practical translation: keep the mid-shift meal protein-anchored, moderate-carb, and moderate-fat; avoid the vending-machine soda-and-chips shape; and, if you can, taper carbs slightly in the last 3 to 4 hours of a night shift. This is the mechanistic reason meal timing and chrononutrition is not the same guide as this one — chrono-effects are still real on a shifted schedule, but the reference window rotates.

4. Social and family meal collisions on days off drive weekend overeating

Cain 2020 in Sleep Medicine Reviews reviewed the “social jetlag” side of shift work: on days off, workers eat family meals, attend social events, and revert to a day schedule that collides with the circadian phase their body is still adjusting to. The result is a Saturday-and-Sunday overeating pattern that is not weakness — it is the meal-cue side of an intact family life plus a rotating clock. The workable response is not to ban social meals but to plan them, keep them roughly protein-anchored, and accept a small caloric overage on a changeover day rather than trying to run a strict deficit on top of a sleep-shifting body.

The 3-hour rule for pre-shift meals

The pre-shift meal is the single highest-leverage lever a shift worker has. Eaten right, it front-loads calories into the active period, holds energy through the first half of the shift, and prevents the vending-machine binge at 2 a.m. Eaten wrong (or skipped), it drives the 3 a.m. sugar-and-caffeine spiral.

The unifying rule is 3 hours before shift start, 30-45 g of protein, complex carbs, some fat, no simple sugar. If you cannot make that meal at home, the workable fallback is a 30 g protein shake plus a piece of fruit — better than skipping.

What to eat during the shift — 5 real templates

Every template below is designed to sit in a hospital fridge, ambulance cooler, or truck cab; be eaten in 10 minutes at a desk or on a bench; and land under about 600 kcal with at least 25 g of protein.

If none of the templates fit your equipment or budget, the fallback formula is: one lean-protein source (turkey, chicken, tuna, eggs, Greek yogurt, cottage cheese, lentils, tofu), one complex carb (whole-grain, brown rice, oats, beans, sweet potato), one non-starchy vegetable, and one moderate fat (avocado, olive oil, nuts). Aim for ≤600 kcal and ≥25 g protein, and you will beat the vending-machine option by a wide margin. For the pre-shift version of this, see our high-protein breakfast ideas — the same shape works as a pre-shift meal, just shifted in time.

Day-sleep protocol — the sleep side is not optional

Day-sleep is 90 minutes of harder to fall asleep, 40 minutes of shorter total sleep, and a fragmented architecture compared to matched night-sleep, per Kecklund 2016 (BMJ review of shift-work health outcomes). Protecting it is not a luxury — it is the single biggest predictor of whether the appetite side of the plan holds together the next shift.

• Blackout bedroom. Blackout curtains, foil on windows if needed, no clock LEDs facing the bed. Melatonin is suppressed by roughly 50% at 100 lux of overhead light per Chellappa 2019 (Journal of Clinical Sleep Medicine — evening light exposure and metabolism), and even a bright afternoon room can meaningfully cut sleep quality.
• Ear plugs or white noise. Foam ear plugs (32 dB NRR) are cheaper and often more effective than white noise machines; a fan works too. Household noise and traffic are the two biggest daytime sleep disruptors.
• Cool room, 62-68°F. Sleep-onset requires a small drop in core temperature. A warm afternoon bedroom fragments the first cycle.
• Blue-light blocking on the commute home. Amber sunglasses or blue-blocking clip-ons for a morning drive home reduce the melatonin-suppression signal the sun sends on the way home from a night shift. Not necessary if the commute is short and you go straight into a blackout room.
• Caffeine cutoff 6 hours before target sleep. For a 7 a.m. end-of-shift and 8 a.m. sleep target, no caffeine after roughly 1 a.m. This single rule fixes more sleep than any other.
• Short 20-minute nap if needed. A pre-shift 20-minute nap on days you slept badly is fine and does not fragment night-shift performance. Longer naps push into slow-wave sleep and grogginess.
• Fixed sleep window on days off, within reason. Full day-schedule reversion on Saturday and Sunday makes the Sunday-night-back-to-work shift brutal. The compromise is a 2-3 hour anchor sleep during your usual day-sleep window on days off, plus normal social evening sleep.

If your day-sleep is still <5 hours after these fixes, the next stop is a sleep-medicine evaluation — for shift-work sleep disorder (SWSD), obstructive sleep apnea, or both. Both have specific treatments. Do not accept “night shift ruins sleep” as a permanent answer; the insomnia and weight loss plan applies with modifications, and CBT-I is effective in shift workers.

Time-restricted eating for night workers — anchor to activity, not calendar

Time-restricted eating (TRE) is one of the most-studied nutrition interventions of the last decade, and it works on night shift with one critical translation: anchor the eating window to activity start, not to the calendar day. Sutton 2018 in Cell Metabolism established that an early TRE window improves insulin sensitivity and blood pressure in prediabetic men even without weight loss. Manoogian 2022 in Cell Metabolism is the shift-work paper: a 10-hour eating window in 137 San Diego firefighters improved cardiometabolic markers with high adherence across a rotating 24-on/48-off schedule. The window ran roughly from first meal after wake to last meal 10 hours later — not “8 a.m. to 6 p.m.” in absolute terms.

For a 7 p.m.-to-7 a.m. shift worker, the workable window is roughly 3 p.m. to 1 a.m. (10-hour) or 3 p.m. to 5 a.m. (14-hour). That covers the pre-shift meal, the mid-shift meal, and a small post-shift snack. The pre-sleep window (5 a.m. to 3 p.m. next day) then covers day-sleep. On a rotating schedule, slide the window with the rotation — the internal rule (“10-14 hours anchored to wake”) does not change.

Two cautions. First, if you are on insulin, a sulfonylurea, or a GLP-1 plus one of those, the longer the fasting window the higher the hypoglycemia risk overnight — your prescriber will need to adjust the regimen. See our intermittent fasting guide for the general TRE-plus-medication considerations; the shift-work version compresses that. Second, if your day-sleep was bad, the ghrelin rebound will blow through the window — accept a slightly longer window on those days rather than fight it and binge.

Exercise timing — one session between wake and shift start

The best window for shift-worker training is between wake and shift start, about 60-90 minutes after the pre-shift meal. That places one 30-45 minute session inside your active period, primed by the pre-shift meal, and not colliding with target sleep. Options: home bodyweight circuit, quick gym visit, or a brisk 40-minute walk if resistance is not available that day. Aim for resistance training at least 2 times per week to protect lean mass — this is not cosmetic; sleep debt drives muscle-protein-breakdown and shift workers are especially prone to losing lean while dieting (see sarcopenic obesity for the full mechanism).

Avoid vigorous exercise within 90 minutes of target sleep. Late-shift workouts drive up core temperature and cortisol and push sleep onset. If your only free time is post-shift, keep it to a walk or light mobility work, not a hard session.

For the wider exercise-modality picture, see exercise for weight loss and the best time to exercise for weight loss chrono-training piece. For readers who want a structured no-gym plan that adapts well to shift schedules, our home-workouts-for-weight-loss guide covers the 8-week bodyweight program.

Realistic 30-day-to-12-month time course

Individual response varies. This trajectory approximates the aggregate literature for a shift worker executing the full stack.

Weight regain risk is highest in the 12-24 month window if the sleep-side protocol lapses. Regain patterns tend to correlate with day-sleep degradation before they correlate with dietary drift. Track with weekly weigh-ins, monthly waist measurements, and a quarterly cardio-metabolic panel — the how to track weight loss progress guide covers a shift-worker-appropriate cadence.

Special situations

Hospital nurse — 3 × 12s

Three 12-hour shifts stacked (Mon-Tue-Wed or similar) plus 4 days off is the most common US nursing pattern. Weight-loss success on this schedule usually comes from batch-cooking on Sunday for the 3-shift block, tolerating a mild deficit only during the on-shift block, and running a normal-calorie or maintenance eating pattern on the 4 off days. Do not try to run a hard deficit across all 7 days; the on-shift stress-eating rebound is predictable.

EMS / ambulance — 24-hour shifts

24-hour shifts are the worst schedule for sleep and appetite regulation. Aim to sleep 2-4 hours during the shift if operationally possible, keep protein-anchored meals in a cooler (do not eat station snacks), and treat the post-shift day as pure recovery — one nap, one full sleep, one clean meal cadence. Do not train hard the day of a 24. Vetter 2018 in Circulation — the paper on shift work and CVD risk — specifically flagged 24-hour shifts as the highest-cardiometabolic-risk schedule. See cardiovascular disease and weight loss for the wider CVD-risk-and-weight picture.

Oilfield and offshore — 14-on / 14-off rotations

Rotational workers gain and lose weight in cycles that map to the 14/14. The workable plan is a strict on-hitch eating template (batched, protein-anchored, moderate-carb) plus normal-eating-plus-training on the 14 off. Alcohol on the off-hitch is the most common weight-plateau driver — see alcohol and weight loss for the calorie-and-appetite math. Frequent site-to-site travel between hitches is its own circadian challenge; the meal-and-sleep protocols in travel and weight loss transfer directly.

DOT truckers

DOT hours-of-service rules limit driving windows but not eating windows. The workable plan is a cab-cooler with 3 pre-batched meals plus 2 snacks per day, water-only during driving hours, and a 20-minute walk at every mandatory 30-minute break. Fast-food is the default trap; the fallback template is a grilled-chicken sandwich (no mayo), side salad, and water — available at most highway stops for ~500 kcal, ~35 g protein.

Rotating manufacturing (2 days / 2 nights / 4 off)

The 4-off block is your reset lever. Use day 1 of the off block for full sleep restoration, day 2 for a normal-cadence meal-training day, days 3-4 for social meals and a full clean sleep pattern before the next 2 days start. Do not try to run a deficit on the 2-nights side of the rotation; keep it maintenance.

On-call physician / medical resident

Sleep debt on call is chronic. The workable protocol is a strict pre-call meal, a prepacked mid-call meal (do not rely on the resident lounge), a hard caffeine cutoff about 6 hours before target sleep even on-call, and a mandatory 2-4 hour anchor sleep during any call block that permits it. Weight goals should be maintenance during residency for most, active loss during elective months or after graduation.

Postpartum plus shift work

The intersection of shift work with postpartum sleep debt and breastfeeding energy needs is one of the hardest schedules for weight loss, and the honest answer is that active weight loss is often the wrong goal in the first 3-6 months. See our breastfeeding and postpartum weight loss guide for the calorie-floor and lactation-safety rules; layer the shift-work meal-timing on top of those once loss is appropriate.

On GLP-1 shift worker

Semaglutide or tirzepatide plus shift work has two mechanical friction points: nausea in dose escalation is worse when overlaid on sleep debt (schedule escalations during off-blocks when possible), and satiety-driven protein under-eating inside a compressed shift-worker window is a lean-mass risk. Aim for 1.2-1.6 g/kg body weight of protein, resistance train ≥2×/week, and see our GLP-1 medication and shift-work overlap in the sarcopenic obesity piece for the lean-mass side.

Type 2 diabetes + CGM + shift work

Overnight glucose intolerance is measurable on a CGM in shift workers — a 3 a.m. mid-shift meal often produces a bigger area-under-the-curve than the same meal at noon. Do not adjust insulin blindly to “cover” a night-shift meal; coordinate with your endocrinology team. See type 2 diabetes remission and weight loss for the wider remission-track picture.

Myths and red flags

• Myth: skipping meals on shift saves calories. No. Skipped mid-shift meals usually rebound at the 7 a.m. vending machine or the 8 a.m. drive-through, and the net calorie count is higher, not lower.
• Myth: coffee replaces sleep. No. Caffeine masks sleep debt performance-side; it does not restore the sleep-hormone axis, and it fragments the next day-sleep if timed wrong.
• Myth: more melatonin works better. No. 0.3-0.5 mg beats 3-10 mg for shift-work phase shifting per the AASM SWSD guidance and the Buscemi 2005 BMJ meta-analysis. Higher doses produce next-shift grogginess.
• Myth: night-shift eating is basically the same as day-shift eating, just at different clock times. No. Overnight glucose intolerance is real (Morris 2015; Morris 2016), and the same meal metabolizes differently during the biological night. Meal shape matters more, not less.
• Red flag: new-onset chest pain, unexplained arrhythmia, or syncope after a stretch of long night shifts. Vetter 2016 in JAMA — the Nurses’ Health Study cohort on rotating night shifts and CVD — and Vetter 2018 in Circulation — the broader shift-work-CVD review — both document real cardiovascular risk elevation in long-tenure night workers. Call 911 for chest pain; do not “power through” a shift.
• Red flag: intrusive thoughts of self-harm during sleep debt. Sleep debt worsens depression and suicidal ideation. Call or text 988 (Suicide & Crisis Lifeline) in the US. Do not wait until after the shift.

NEDA callout and Night Eating Syndrome overlap

Overnight-binge patterns in shift workers can look like Night Eating Syndrome but are usually a physiological response to circadian misalignment rather than a primary eating disorder (Vetter 2013 in Current Opinion in Endocrinology, Diabetes and Obesity). If your night eating is compulsive, occurs on days off the same way as on shift days, is accompanied by morning anorexia that persists into your normal off-schedule, and is causing distress or impairment, screen for NES — see the night eating syndrome and weight loss guide for the diagnostic side. If you notice a compulsive-binge pattern at any hour, contact the NEDA helpline at 1-800-931-2237.

Bottom line

Shift work is a real independent risk factor for weight gain and metabolic disease, and the schedule fights you at the margins — but the plan is tractable. Anchor the eating window to your activity start, not the calendar day. Protein-anchor the pre-shift meal 3 hours before clock-in. Keep the mid-shift meal moderate-carb and under 600 kcal. Cut caffeine 6 hours before target sleep. Protect day-sleep with a blackout bedroom. Train resistance at least twice a week between wake and shift start. Realistic loss is 0.5-1 pound per week, 8-20 pounds over a year, matched to a day worker’s rate. If chest pain, syncope, or suicidal ideation appear during a stretch of shifts, seek care immediately — the schedule is not worth the risk, and both are recognized medical consequences of shift work, not moral failures.