How to sleep after a night shift: a light plan that works
How to sleep after a night shift is rarely a question about your bed. It is a question about the drive or bus ride home. At 7am you walk out into daylight, and your body clock reads it as the start of the day. You fall asleep exhausted, then wake up four hours later.
Light is the strongest signal your body clock has, and you can time it: bright in the first half of the shift, dimmer towards the end, dark on the way home. This guide covers what studies with nurses and other night workers actually measured, where the evidence is thin, and what a realistic plan looks like for the NHS, the police and warehouse work.
This is the hands-on part for shift workers of our main article on whether blue light glasses really help you sleep. That article explains how light affects melatonin and your body clock. This one deals with a specific problem: you work nights and have to sleep while the sun is up.
Why is sleep after a night shift so short?
Your body clock runs on a roughly 24-hour cycle and sets itself mainly by light. Bright morning light tells it that the day has started. That is exactly the signal you get when you leave the ward, the station or the distribution centre at 7am. Your body switches into its daytime mode just as you want to go to bed.
Most night workers know the result. You drop off quickly because you are shattered, then wake after a few hours and cannot get back to sleep. The Health and Safety Executive describes daytime sleep as usually lighter, shorter and of poorer quality than sleep at night. The French occupational safety institute INRS adds something many people would rather not hear: even after years, nobody fully gets used to night work. The dip in alertness between roughly 2am and 5am stays.
Worth knowing
You cannot switch off your body clock, but you can move it. The main tool for that is not caffeine or melatonin. It is the timing of light and darkness.
What do studies show about light and night shifts?
This research comes mostly from occupational medicine and predates the current blue light trend. The principle is the same in every study: plenty of light in the first half of the night, very little light in the morning.
Night nurses: bright light and tinted goggles
In a field study in Montreal (Boivin and James 2002), 10 nurses on permanent nights received intermittent bright light of around 3,200 lux for six hours during their shift. On the way home they wore heavily tinted goggles that let through only 15% of light. Their body clocks shifted by an average of 9 to 11 hours, compared with 4 to 5 hours in a control group of 9 nurses without these measures. Sleep started two hours after the end of each shift.
A Korean study with 12 night nurses (Yoon et al. 2002) compared three set-ups. Daytime sleep was best when the nurses got bright light at night and also cut down morning light on the way home with sunglasses. Bright light alone helped less.
Sunglasses on the commute
At Rush University in Chicago, Charmane Eastman's team tested different combinations with 67 young adults on simulated night shifts (Crowley et al. 2003). Those who only had normal room light during the shift benefited more from very dark sunglasses than from ordinary ones. With bright light during the shift, the shift in the body clock was so large that darker glasses added little. Melatonin tablets brought no extra benefit in this study.
Blue-blocking glasses instead of sunglasses
The body clock responds most strongly to short-wavelength, blue light. A pilot study in Quebec (Sasseville et al. 2009) therefore tested glasses that block light below 540 nanometres. 28 night workers at a postal sorting centre wore them on the way home and outdoors until 4pm. They slept 32 to 34 minutes longer per day on average and woke less often. The catch: there was no control group, only a comparison with the two weeks before.
So how strong is the evidence?
A Cochrane review from 2016 (Slanger et al.) looked at 17 randomised trials on measures against sleepiness and poor sleep in shift workers, ten of them on bright light. The quality of evidence was mostly low to very low and the overall results were inconclusive. Bright light at night produced a small reduction in sleepiness during the shift. Put simply, the idea is well founded in physiology, but the field studies are small.
| Study | Participants | What was tested | Result |
|---|---|---|---|
| Boivin and James 2002 | 19 night nurses | bright light on shift, tinted goggles in the morning | body clock adapted far better to night work |
| Yoon et al. 2002 | 12 night nurses | bright light at night, with or without sunglasses | best daytime sleep with light plus sunglasses |
| Crowley et al. 2003 | 67 young adults | light, sunglasses and melatonin in combinations | dark glasses help most when there is no bright light on shift |
| Sasseville et al. 2009 | 28 postal workers | blue-blocking glasses in the morning | about 30 minutes more sleep per day, no control group |
| Slanger et al. 2016 | 17 trials | Cochrane review | evidence mostly low to very low |
Your light plan for night shifts
The studies point to a routine that fits most jobs. Adjust the times to your own rota.
| Phase | Light | What you do |
|---|---|---|
| First half of the shift | as bright as possible | use well-lit areas, do not spend breaks in a dim staff room |
| Last two hours | dimmer where you can | turn screen brightness down, no more caffeine |
| Journey home | as dark as possible | blue-blocking glasses on the bus or train, normal sunglasses if you drive |
| At home | dark | in bed within one to two hours, room fully blacked out |
| Afternoon | daylight | get outside after you wake, before the next shift |
The INRS also advises employers to use high light levels at the start of a night shift and lower levels towards the end. You rarely control the lighting at work. What you do control is where you spend your breaks: in the brightest spot rather than the darkest corner.
The journey home: where daytime sleep is won or lost
This is the moment the studies focused on. Our red blue light glasses for the commute home filter 100% of blue light according to the manufacturer, with a stated filter range of 190 to 590 nanometres. That covers the range the glasses in the Sasseville study blocked. They weigh 20 grams and fit in a jacket pocket.
Not for driving
Red lenses distort colours heavily. Traffic lights, brake lights and blue lights are harder to read. Wear the glasses only as a passenger, on public transport, walking away from traffic, or from your front door onwards. If you drive, use sunglasses that are suitable for driving. After a night shift, drowsiness at the wheel is the bigger risk anyway: the HSE suggests public transport or a taxi where possible, and pulling over if you feel sleepy.
If you are not sure which tint suits your routine, our guide to red vs orange blue light glasses compares both. For the trip home after nights, red is the more consistent choice because the aim is maximum shielding.
Your bedroom during the day
- Fully dark: blackout blinds or heavy curtains, or an eye mask. Every gap of light at the edge counts.
- Cool: the HSE notes that cool conditions improve sleep. In summer, close the blinds early in the morning before the room heats up.
- Quiet: earplugs or steady background noise, phone on silent, and let the people you live with know your sleep times.
- Comfortable air: central heating dries the air in winter. Our article on ideal bedroom humidity for sleep gives the target values.
"The part people almost always underestimate is the time between clocking off and getting into bed. A quick shop, breakfast, scrolling the phone, and all of it in daylight. Keep that window short, dark and calm. It costs nothing, and it is exactly where the studies made the difference."
Daniel Volpe, coachPermanent nights or rotating shifts: what changes?
Most of the studies above were done with permanent night workers. In the NHS, the police and logistics, rotating rotas are more common. Then a full switch to a night rhythm is neither realistic nor sensible, because you are back on earlies after two or three nights.
For this situation, Eastman's team tested a compromise (Smith et al. 2009). The body clock is shifted only far enough that the low point of alertness moves out of the night shift and into the first half of daytime sleep. The tools were bright light on shift, dark sunglasses outside, fixed sleep times in a dark room and deliberate afternoon daylight as a brake, so the clock did not drift too far. Participants reached the target and performed better on their night shifts. On days off, that means going to bed late and getting up late, without turning your rhythm all the way back.
If your sleep stays poor for weeks, use your employer's occupational health service. Shift patterns are part of their remit, and they can look at the rota, not just at you.
Training around night shifts: when does it fit?
Plenty of night workers train straight after a shift because the gym is quiet. For sleep, that is not ideal: the HSE advises against vigorous exercise just before bed because it raises body temperature. Training after you wake in the afternoon fits better, and you get the daylight your body clock needs as a brake at the same time. For the bigger picture on balancing training and rest, see our guide to muscle recovery after a workout.
If you spend eight to twelve hours on your feet on a ward or in a warehouse, you probably know heavy legs after a shift too. What can help, and when to get it checked, is covered in our article on heavy legs and compression.
Who this light plan suits and who it does not
A good fit if you
- work regular nights, for example in nursing, policing, ambulance work or logistics
- get home by public transport or as a passenger
- fall asleep during the day but wake after a few hours
- are willing to keep your bedroom and your journey home consistently dark
Not suitable or not enough if you
- drive yourself and want to wear the red glasses on the road. That is not safe.
- need accurate colour vision on shift, for example for monitors, warning lights or medication. Put the glasses on only after you finish.
- have slept badly for weeks, nod off unintentionally during the day or feel constantly exhausted. Please see occupational health or your GP. Glasses are not a treatment for sleep disorders.
Conclusion
Daytime sleep after a night shift is mainly disrupted by light at the wrong time, and bright light on shift combined with darkness on the way home is the approach with the clearest research behind it. Regular night workers who do not drive home and who black out their bedroom properly stand to gain the most. The studies are small, a Cochrane review rates the evidence as weak, and if sleep problems persist, no gadget replaces a proper medical check.
Frequently asked questions
What is the best way to sleep after a night shift?
Should I go straight to bed after a night shift?
Do blue light glasses help after a night shift?
Can I drive in red blue light glasses?
What should I do on days off between night shifts?
How much sleep do I need after a night shift?
Sources
- Boivin, D. B. & James, F. O. (2002). Circadian adaptation to night-shift work by judicious light and darkness exposure. Journal of Biological Rhythms, 17(6), 556–567. – Field study with night nurses, bright light plus tinted goggles
- Crowley, S. J. et al. (2003). Combinations of bright light, scheduled dark, sunglasses, and melatonin to facilitate circadian entrainment to night shift work. Journal of Biological Rhythms, 18(6), 513–523.
- Smith, M. R., Fogg, L. F. & Eastman, C. I. (2009). Practical interventions to promote circadian adaptation to permanent night shift work: study 4. Journal of Biological Rhythms, 24(2), 161–172.
- Sasseville, A. et al. (2009). Wearing blue-blockers in the morning could improve sleep of workers on a permanent night schedule: a pilot study. Chronobiology International, 26(5), 913–925.
- Yoon, I. Y. et al. (2002). Bright light exposure at night and light attenuation in the morning improve adaptation of night shift workers. Sleep, 25(3), 351–356.
- Slanger, T. E. et al. (2016). Person-directed, non-pharmacological interventions for sleepiness at work and sleep disturbances caused by shift work. Cochrane Database of Systematic Reviews, CD010641. – Cochrane review, 17 randomised trials
- Health and Safety Executive (HSE): Hints and tips for shift-workers.
- INRS (2025). Travail de nuit : mieux comprendre les risques pour agir en prévention (updated 14 March 2025).
- Ractiveone: Recovery blue light glasses red, filter and recommended use (manufacturer information)
