Anyone who has raised sleep problems has received the same list — dark room, cool temperature, no screens, regular schedule, no caffeine late. For chronic insomnia, this list is not the treatment, and the distinction matters.
What sleep hygiene is
A set of behavioural and environmental recommendations intended to support good sleep in the general population.
They are sensible, low cost, and each has some evidence behind it.
What they were not designed to be is a treatment for a sleep disorder.
The evidence on it as a treatment
Studies comparing sleep hygiene education against established insomnia treatment consistently find it less effective.
It is frequently used as the control condition in trials, precisely because it is plausible and inactive enough to serve that purpose.
Which is a fairly direct statement about how the research community regards it.
Why it fails specifically
Chronic insomnia is maintained by different mechanisms from those sleep hygiene addresses.
The dominant model identifies conditioned arousal — the bed and bedtime have become associated with wakefulness and frustration, so approaching them triggers alertness.
Compensatory behaviours make it worse. Going to bed earlier, staying in bed longer, and napping all reduce sleep pressure and weaken the association between bed and sleep.
Which means the natural response to poor sleep actively maintains it.
What the actual treatment involves
Cognitive behavioural therapy for insomnia has several components, and the two doing most of the work are counter-intuitive.
Stimulus control means using the bed only for sleep, getting up if not asleep within a period, and returning only when sleepy, which rebuilds the association.
Sleep restriction means deliberately limiting time in bed to approximately the actual sleep time, which increases sleep pressure and consolidates sleep, then gradually extending as efficiency improves.
Both involve spending less time in bed, which is the opposite of what people with insomnia want to hear.
Cognitive components address beliefs about sleep, and relaxation techniques are frequently included.
Why it is not offered more
Clinical guidelines in several countries recommend it as first-line treatment ahead of medication.
Availability is limited by a shortage of trained practitioners, which is the practical obstacle.
Digital versions have been developed and tested, with reasonable evidence, and they have expanded access considerably.
Many people with chronic insomnia are prescribed medication or given the hygiene list, and never told the treatment exists.
The medication question
Sedative medications reduce time to sleep onset, and guidelines generally recommend short-term use only.
Tolerance develops with some, dependence is a risk with others, and rebound insomnia on discontinuation is common.
Which is why the behavioural treatment is preferred despite requiring more effort — its effects persist after treatment ends, and medication effects do not.
What sleep hygiene is still good for
Occasional poor sleep in people who generally sleep well.
Supporting the behavioural treatment rather than replacing it.
And avoiding the obvious problems, since caffeine at night and a bedroom that is too warm genuinely do interfere.
The other conditions
Sleep apnoea, restless legs, circadian rhythm disorders and several others present as insomnia and require entirely different treatment.
Snoring with witnessed pauses in breathing, or excessive daytime sleepiness despite adequate time in bed, are specific reasons to see a doctor promptly.
Sleep apnoea in particular is common, frequently undiagnosed, and has significant cardiovascular consequences when untreated.
Sleep effort
A concept worth knowing about because it explains a paradox.
Trying to sleep is incompatible with sleeping, since effort produces arousal.
Which means the harder someone tries, the worse the outcome, and the more they try in response.
Paradoxical intention — deliberately trying to stay awake while lying comfortably — has been studied as a treatment component and works by removing the effort.
It sounds absurd and it has trial support.
Sleep misperception
Many people with insomnia substantially underestimate how much they slept when compared against objective measurement.
Which does not make the distress unreal — the experience of lying awake is genuinely unpleasant regardless.
It does mean the daytime consequences may be smaller than feared, and that reassurance is itself part of treatment.
The catastrophic beliefs about what poor sleep will do are among the things treatment addresses directly.
Getting the treatment
Asking a doctor specifically for cognitive behavioural therapy for insomnia, by name, is more likely to produce it than describing the problem generally.
Digital versions with evidence exist and availability varies by country.
Books based on the same protocol exist and have some trial support when used alone.
The first weeks
Sleep restriction initially reduces total sleep, which makes people feel worse before they feel better.
Which is explained in advance in proper delivery and is the main reason people abandon it when attempting it unsupported.
Driving and operating machinery need care during that period, and this is a real safety point rather than a formality.