It’s linked with worse sleep. In a study published 9 October 2026 in Sleep Health, 375 adults in rural Eastern Kentucky who used a computer for work infrequently in the hour before sleep scored 0.70 points higher on a 0–8 sleep health scale than frequent users. They also had higher odds of favorable daytime alertness and less time awake during the night.
Key takeaways
- In a 2026 Sleep Health study of 375 adults in 12 economically distressed counties of Eastern Kentucky, infrequent work-related computer use in the hour before sleep was linked with a sleep health score 0.70 points higher on a 0–8 scale.
- The same adults had about 2.3 times the odds of good daytime alertness and about 3.2 times the odds of a favorable score for time awake after falling asleep.
- The authors suggest that cognitively engaging, work-related technology may be particularly hard on sleep.
- In a 2015 PNAS lab study, reading on a light-emitting e-reader before bed suppressed evening melatonin by about 55% and delayed the body clock by about 90 minutes compared with a printed book.
- The one change: set a work cutoff at least an hour before bed, and put a screen-free wind-down in that hour.
What did the 2026 study find?
Adults who did computer work infrequently in the hour before sleep had better overall sleep health scores. Researchers from the University of Kentucky, the University of Miami and the University of Arizona surveyed 375 adults in the REST-KY study, drawn from 12 economically distressed counties in Eastern Kentucky. Participants were mostly female (73.3%) and White (97.3%), with an average age of 45.6.
Each person reported how often they used different technologies in the hour before sleep. Sleep was scored across 8 dimensions: satisfaction, alertness, timing, efficiency, duration, duration irregularity, social jetlag and wake after sleep onset, for a score from 0 to 8. The average was 5.1.
| Measure (infrequent vs frequent work-related computer use before sleep) | Result |
|---|---|
| Overall sleep health score (0–8) | 0.70 points higher (95% CI 0.26 to 1.14) |
| Good daytime alertness | about 2.3 times the odds (OR 2.33) |
| Favorable wake after sleep onset | about 3.2 times the odds (OR 3.15) |
The overall-score model was adjusted for sociodemographic factors, mental health symptoms, chronotype and sleep medication use. The authors suggest that cognitively engaging, work-related technology use may be particularly detrimental to sleep.
Why might work at bedtime matter more than other screen time?
One possible answer is engagement: work keeps the mind switched on. The authors describe work-related computer use as cognitively engaging and suggest, from the differences they saw across technology types, that it may be particularly detrimental to sleep. The study did not test the mechanism, so this is an explanation, not a finding.
Light is the other part of the story. In a 2015 Proceedings of the National Academy of Sciences crossover study, 12 healthy young adults spent 14 days in a lab and read for about 4 hours before bed on either a light-emitting e-reader or a printed book. With the e-reader, they took about 10 minutes longer to fall asleep, their evening melatonin, the hormone that signals night, was suppressed by about 55%, their body clock ran about 90 minutes later, and they felt sleepier the next morning. A laptop full of email combines both: bright light and an alert mind.
What is “sleep health”?
Sleep health is more than hours in bed. Daniel Buysse of the University of Pittsburgh proposed the idea in a 2014 paper in Sleep: a multidimensional pattern of sleep and wakefulness that supports physical and mental well-being. He named five dimensions: duration, efficiency, timing, alertness during the day, and satisfaction with sleep.
The 2026 study used an extended version with eight dimensions, adding regularity, social jetlag and time awake during the night. That is why one habit can move several parts of the score at once. For the duration piece, the American Academy of Sleep Medicine and the Sleep Research Society recommend 7 or more hours per night for adults.
What is the one change to make?
Set a work cutoff at least one hour before bed, and protect that hour. Close the laptop, log out of work email and messaging, and fill the time with something that winds the mind down.
- Pick your bedtime by counting back from your wake time: 8 hours in bed for 7 or more hours of sleep.
- Set the work cutoff at least 1 hour earlier, and 2 hours if you can.
- Write one line for the first task of the next workday, so open loops have a place to land.
- Charge the work laptop outside the bedroom.
- Fill the last hour with a printed book, stretching, a shower or a conversation.
Our guide to a caffeine cutoff time covers the same idea earlier in the day, and World Mental Health Day: Light, Rhythm and Your Mind explains why evening light matters for mood. For why structure beats willpower, read Beyond Willpower. Curious whether your rhythm runs early or late? Take the Body Clock Type quiz.
What are the limits of this evidence?
The 2026 study shows an association, not cause. It was observational and survey-based, and the sample came from one rural region and was mostly White and female, so the results may not apply everywhere. People who work late may also differ in stress or job demands. The 2015 lab study was small (12 people) and tested light, not work. Together they point the same way: keep the last hour before bed free of work screens.
Your day on My BodyClock
The day above on My BodyClock shows a workday with a firm work cutoff. Sleep runs from 10:30 PM to 6:30 AM. A morning walk, breakfast and focused work fill the first half of the day; a lunch break, afternoon work and a workout follow. Dinner with family and hobby time come next, then a Flow block from 8:45 PM to finish the day’s admin and close the laptop by 9:30 PM, one hour before bed. From 9:30 PM, a screen-free wind-down with a printed book leads to bed.
Swap in your own wake time and count back. Build your version in Owaves: My BodyClock on the App Store, or join the Android waitlist.
FAQ
Is it bad to work on a laptop right before bed?
It is linked with worse sleep. In a 2026 Sleep Health study of 375 adults, frequent work-related computer use in the hour before sleep was associated with a lower sleep health score, poorer daytime alertness and more time awake during the night. The study was observational, so it shows an association, not proof of cause.
How long before bed should you stop working?
At least an hour is a reasonable start, because that is the window the 2026 Sleep Health study measured. Earlier lab work found that reading on a bright screen for about 4 hours before bed delayed the body clock by about 90 minutes, so a longer screen-free buffer may help further.
Is reading on a phone or tablet in bed as bad as working?
Screen light alone can matter: in a 2015 PNAS lab study, 12 young adults took about 10 minutes longer to fall asleep after reading on a light-emitting e-reader than after a printed book. The 2026 Kentucky study suggests that work tasks may carry an extra cost, possibly because they keep the mind engaged.
How much sleep do adults need?
The American Academy of Sleep Medicine and the Sleep Research Society recommend that adults sleep 7 or more hours per night on a regular basis for optimal health.
Sources
- Mitu MM, Chung J, Slade E, Moga DC, Grandner MA, Moloney ME. Bedtime technology activities and multidimensional sleep health in rural Appalachian adults: Findings from the REST-KY study. Sleep Health, 9 October 2026. doi:10.1016/j.sleh.2026.09.019. https://pubmed.ncbi.nlm.nih.gov/42855354/
- Chang AM, Aeschbach D, Duffy JF, Czeisler CA. Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness. PNAS, 27 January 2015. https://pmc.ncbi.nlm.nih.gov/articles/PMC4313820/
- Buysse DJ. Sleep Health: Can We Define It? Does It Matter? Sleep, 1 January 2014. https://pmc.ncbi.nlm.nih.gov/articles/PMC3902880/
- Watson NF, et al. Recommended Amount of Sleep for a Healthy Adult: A Joint Consensus Statement of the American Academy of Sleep Medicine and Sleep Research Society. Journal of Clinical Sleep Medicine, 15 June 2015. https://pmc.ncbi.nlm.nih.gov/articles/PMC4442216/
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