Shift work guide
Circadian rhythm disruption explained
What the circadian system does, how shift work perturbs it, and which behaviours modestly realign timing without miracle cures.
When you are ready to try these ideas on a real roster, ShiftCoach turns guidance into daily, shift-aware reminders on Android. Get ShiftCoach on Google Play · Features · Pricing
Editorial & accuracy
ShiftCoach Editorial
Health & shift-work desk
Evidence-led writing for shift workers. We cite NHS, WHO, CDC/NIOSH, and occupational sleep medicine sources in each guide and avoid sensational claims.
What the clock actually does
Circadian rhythms coordinate digestion, hormones, temperature, and sleep-wake propensity across ~24 hours. Shift work asks some processes to run at biologically “wrong” hours, which increases sleepiness and can affect metabolism over time — a reason public-health agencies treat night work as a risk factor to manage, not ignore.
Zeitgebers: light, food, activity
Bright light, meal timing, and exercise are powerful timing signals. Used consistently relative to your current shift type, they can modestly improve alertness and sleep quality; used chaotically, they fight each other.
Limits of self-fixes on bad rosters
If your roster flips faster than biology can follow, individual behaviour helps at the margin — roster design, commute length, and protected rest remain upstream levers. ShiftCoach focuses on what you can track and adjust without pretending the roster is optional.
References & further reading
Frequently asked questions
Can I fully reset my circadian rhythm in one day?
Related guides
Next in the series
Shift work and weight gain
Put this guide on your actual roster
Download ShiftCoach on Android to log shifts and get practical coaching that respects nights, rotations, and transition days.
