Does sleep hygiene actually work?

What is sleep hygiene?

The familiar list: keep a consistent bedtime, avoid caffeine late, keep the room dark and cool, cut screens before bed, do not exercise too late, use the bed only for sleep. It is the advice given first to almost everyone who reports sleeping badly.

It sounds sensible because most of it is sensible. The question is whether teaching it to someone with insomnia actually improves their sleep, and that has now been tested at scale.

Does it work?

Not as a treatment. A 2024 component network meta-analysis in JAMA Psychiatry, covering 241 randomised trials and 31,452 participants, found sleep hygiene education was not essential, with an odds ratio of 1.01 and a confidence interval spanning 0.77 to 1.32. The authors state they found no evidence of an association between sleep hygiene education and improved sleep quality.

Furukawa, Sakata, Yamamoto and colleagues ran this. A component network meta-analysis is unusually well suited to the question, because it pulls apart multi-part therapy packages and estimates what each piece contributes rather than testing the bundle as a whole.

An odds ratio of 1.01 means roughly no effect. Sleep hygiene is included in most insomnia programmes, and on this analysis it is along for the ride.

What actually works then?

Four components carried the effect. Cognitive restructuring, meaning changing the anxious thinking about sleep, came out strongest at an odds ratio of 1.68. Mindfulness-based components reached 1.49, sleep restriction 1.49, and stimulus control 1.43. Delivery in person outperformed other formats at 1.83.

The two behavioural ones are worth explaining because they are counter-intuitive and they are the engine of the treatment.

Sleep restriction means deliberately reducing time in bed to match the sleep you are actually getting, which builds sleep pressure and consolidates broken sleep. It feels like the opposite of what you need, and it works.

Stimulus control means getting out of bed when you cannot sleep, so the bed stops being associated with lying awake. Both target the cycle where the bed itself becomes a cue for frustration.

What about relaxation?

This is the finding that will surprise people most. Relaxation procedures came out at an odds ratio of 0.81, pointing to a potentially counterproductive effect. The authors suggest extended relaxation practice may conflict with sleep restriction and stimulus control, since spending long relaxed periods in bed works against the aim of both.

This is one analysis, and the authors describe their findings as hypothesis-generating. It is enough to make a person cautious about lengthy wind-down routines as an insomnia treatment.

So is the advice useless?

No, and the distinction matters. Sleep hygiene appears to be poor treatment for insomnia while remaining reasonable maintenance for ordinary sleep. Caffeine late genuinely disrupts sleep, and a dark cool room genuinely helps. Those facts sit alongside the finding that teaching the list to someone with insomnia does not resolve it.

The practical consequence is about where to spend effort. If you sleep reasonably and want to sleep a bit better, the list is fine. If you have persistent insomnia, this analysis says the standard advice is the least useful part of the treatment, and the components that work are available through cognitive behavioural therapy for insomnia.

Quality of evidence ranged from moderate to very low, dropout was high in some trials, and components were coded as present or absent without accounting for how well each was delivered. The authors flag all of it.