Sleep Hygiene

What it is

There is no founding paper and no single author, and that is part of the story. The list assembled itself out of plausible ingredients, spread because it is cheap and easy to hand over, and was never tested as a package against the condition it is offered for.

Somebody lying awake at three in the morning has almost certainly already done the sleep hygiene. That is what makes this the most useful thing an article can tell them: the failure is not theirs, and the advice was never shown to work on its own.

It is routinely confused with stimulus control, which is a different thing with a different evidence base. Stimulus control is about rebuilding the association between the bed and sleep, and it is one of the supported components of the treatment that does work. Sleep hygiene is a list of environmental tidying. Reading them as the same kind of advice is how the supported thing lends its credibility to the unsupported one.

In effect

Research: what the guideline actually says

The American Academy of Sleep Medicine's guideline on behavioural and psychological treatments for chronic insomnia does not recommend sleep hygiene education as a single-component therapy, on the grounds that it has not demonstrated efficacy on its own. It is recommended only in combination with stimulus control, relaxation, sleep restriction or cognitive therapy. That is a much narrower endorsement than the one in general circulation.

Both sides

For it: the individual ingredients are not nonsense. Caffeine late in the day does affect sleep, and an erratic schedule does. Given alongside a real treatment, the advice is harmless and sometimes helpful.

Against it: handed out on its own, which is how it almost always arrives, it does not treat chronic insomnia. And it carries a cost that is easy to miss. A list of simple instructions that did not work moves the blame onto the person for not having followed it well enough.

Everyday life: what it does not touch

The best-measured link between daytime thinking and a slow night is pre-sleep cognitive arousal, a mind still running after everything else has stopped. Nothing on the sleep hygiene list addresses it. The room was never the variable.

Where we land. Keep the ingredients, drop the claim. This is the same shape as willpower mindset and the publication's other cases of a theory outliving its evidence: the advice survives because it is easy to give, not because it was shown to work.

What it does not say

It does not say the individual items are false. Late caffeine and an erratic schedule do affect sleep. The failure is of the list as a treatment, not of each ingredient as a fact.

It does not say sleep hygiene is harmful in itself. Alongside a real treatment it is fine. The harm is in offering it as the treatment.

It does not say nothing works. Cognitive behavioural therapy for insomnia is the guideline-recommended first-line treatment for chronic insomnia, ahead of medication.

It is not a reason to avoid seeing a doctor. Anyone meeting the pattern described at insomnia disorder should be pointed at a GP rather than at a list, including this one.

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