Experiment guides → Habits & wind-down → Reading
Does reading before bed help you sleep?
Quick answer: modestly, yes — with the right kind of book. In a randomised trial run entirely online with 991 adults, people assigned to read a book in bed for a week were more likely to say their sleep had improved than those assigned not to read: 42% versus 28%. The effect is self-reported and the trial was pragmatic, but it's randomised and large. The medium matters: a lab study found reading on a bright backlit screen delayed the body clock and reduced next-morning alertness compared with a printed book. Reading is a wind-down with a control condition built in — a paper book one week, nothing the next.
"I will read a paper book for 20 minutes before lights-out for 7 nights, then not read for 7."
What the research says
The People's Trial: 991 people, randomised online. Finucane and colleagues ran a public-participation randomised trial: 991 adults were assigned to read a book in bed before sleep for seven nights, or not to read in bed. After the week, 42% of the reading group reported their sleep had improved, compared with 28% of the non-reading group — an 8–22 percentage-point difference after accounting for uncertainty. Self-reported, unblinded, and still the biggest randomised test of bedtime reading there is (Finucane et al., 2021).
Paper versus backlit screen: the medium matters. Chang's crossover compared four hours of evening reading on a light-emitting e-reader with reading a printed book. The screen suppressed melatonin by about 55%, delayed the circadian clock by about 1.5 hours, lengthened sleep onset and reduced REM, and left people less alert the next morning. The printed book did none of that (Chang et al., 2015).
Why it might work: displacement and de-arousal. Reading occupies the hour that phones otherwise fill — a systematic review found bedtime digital media use consistently linked to later bedtimes, longer sleep onset and worse quality — and it lowers cognitive arousal by giving the mind something absorbing but low-stakes. A book is both a replacement and a wind-down (Brautsch et al., 2023).
What this evidence doesn't say
The large trial measured whether people felt their sleep improved, not sleep itself, and participants knew which group they were in. One week is short, and "reading a book" wasn't standardised — thriller or poetry, five minutes or fifty. Strict stimulus-control protocols would say don't read in bed at all; that's a different experiment for a different problem.
Run it as an experiment
- Three baseline nights, whatever you normally do. Morning ratings — sleep quality, restedness, time-to-sleep — and a note on what filled the last 20 minutes before lights-out (usually a phone).
- Week one: 20 minutes of paper, then lights out. A printed book or an e-ink reader with the front light low. Fiction or something absorbing but not gripping enough to keep you up — save the thriller for daytime.
- Week two: no reading. Lights out at the same time, no substitute screen. This week tells you whether the reading was doing something or just displacing the phone.
- Make the pact. "I will read a paper book for 20 minutes before lights-out for 7 nights, then not read for 7." Same bedtime, same wake time both weeks.
- Compare time-to-sleep and mornings. Reading week better? Keep the book. Both weeks better than baseline? The phone leaving was the active ingredient, and the book is optional. No difference? A cheap negative result.
What to expect
Most people find the reading week gives a smoother drop into sleep, partly because the phone is gone and partly because a book is a decompression chamber. A few find reading in bed makes them more alert — the bed-becomes-a-reading-chair effect — and for them the no-reading week is better; that's a legitimate result and points at stimulus control. Twenty minutes is a guide, not a rule; stop when your eyes drop.
Who should skip this
No risk. If you have chronic insomnia and are following a stimulus-control protocol, don't add reading in bed — it conflicts with the treatment; read in a chair instead, then go to bed when sleepy.
Frequently asked questions
Is it good to read before bed?
The largest randomised test says modestly yes: 42% of assigned readers reported better sleep after a week versus 28% of non-readers. It's self-reported and the effect is small, but it's consistent with what reading does — replaces the phone and lowers arousal.
Is reading on a phone or tablet before bed bad?
A bright backlit screen delayed the body clock and reduced next-morning alertness in a lab study, compared with paper. An e-ink reader with a low front light is close to paper; a phone at full brightness isn't. If you want the benefit, paper is the safe default.
Should you read in bed or in a chair?
If you fall asleep easily, in bed is fine and convenient. If you have trouble sleeping and are working on re-associating bed with sleep, read in a chair and go to bed when sleepy — that's the stimulus-control version, and it has strong evidence for insomnia.
Related experiments
Sources
- Finucane E, O'Brien A, Treweek S, et al. Does reading a book in bed make a difference to sleep in comparison to not reading a book in bed? The People's Trial — an online, pragmatic, randomised trial. Trials. 2021;22:873. PubMed 34996514
- Chang AM, Aeschbach D, Duffy JF, Czeisler CA. Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness. Proc Natl Acad Sci U S A. 2015;112(4):1232–1237. PubMed 25535358
- Brautsch LA, Lund L, Andersen MM, Jennum PJ, Folker AP, Andersen S. Digital media use and sleep in late adolescence and young adulthood: a systematic review. Sleep Med Rev. 2023;68:101742. PubMed 36638702
Track this experiment in N of 1
A few baseline nights, then the change — and your own mornings deliver the result. No streaks, no guilt. Your first experiment is free.
Downloadon the App StoreThis page is general information about published research, not medical advice. If you have a sleep disorder, are pregnant, or take medication, talk to your doctor before changing your routine.