Can't fall asleep: the twenty minutes before, and the rule that fixes most of it

    You were exhausted on the sofa. You got into bed and something switched back on. Now you are lying in the dark doing sums about how many hours are left, which has never once helped.

    Do this now

    Wind-down, ten minutes

    10 minutes

    1. Lights low or off. Phone out of the room, or at least out of reach and face down.
    2. Lie on your side. Mouth closed, nose only, breath silent.
    3. In for four, out for seven or eight. Keep the volume small — the exhale should be long, not big.
    4. Count exhales to ten and start again. The counting is there to crowd out rehearsal, nothing more.
    5. Ten minutes. If you are still awake and irritated twenty minutes later, get up until you feel sleepy.
    Run it with a timer

    Sleep pressure and body clock have to agree

    Falling asleep needs two things at once: enough accumulated sleep pressure, which builds with hours awake, and a body clock that says it is night. A long lie-in, a late nap or an irregular schedule takes the pressure away; late bright light and late caffeine move the clock. If either is off, no amount of trying works, which is why a fixed wake time does more than a fixed bedtime.

    Arousal is the third factor

    Insomnia is characterised by heightened arousal at sleep onset — cognitive and physiological. That is where breathing earns its place: slow nasal breathing with a long exhale lowers heart rate and raises heart-rate variability while you do it, which shortens the gap between lying down and letting go. It is one of the components inside CBT-I rather than a rival to it.

    The bed has to mean sleep

    The highest-yield rule in the whole insomnia literature is stimulus control: the bed is for sleep and sex, nothing else, and if you are awake and frustrated for more than about twenty minutes you get up until you are sleepy. It feels counterproductive and it works, because it stops the bed from being a place where you lie awake worrying about lying awake.

    What changes it, over a week

    • Same wake time every day

      Including weekends. A fixed wake time builds reliable sleep pressure; a fixed bedtime without one does very little.

    • One hour before bed

      Lights down, screens away. Evening light both delays the clock and keeps arousal up.

    • In bed

      Ten minutes of long-exhale nasal breathing. Then the twenty-minute rule, honestly applied.

    • Caffeine

      Nothing after about 2 p.m. Its half-life means an afternoon coffee is still working at midnight for many people.

    When this is not a breathing pattern

    See a clinician — promptly, and before assuming any of this applies to you — if any of these describe you:

    • Insomnia most nights for more than three months — ask specifically about CBT-I, which outperforms sleeping tablets long term
    • Loud snoring, gasping or witnessed pauses in breathing — ask about a sleep study
    • An irresistible urge to move the legs in the evening, which points to restless legs and is treatable
    • Low mood, hopelessness or loss of interest lasting more than two weeks
    • Long-term use of sleeping tablets you want to stop — that needs a supervised taper, not a cold stop

    This page is education, not medical advice, and no part of it is a diagnosis. Full disclaimer.

    Questions people ask

    How long should falling asleep take?
    Fifteen to twenty minutes is typical and healthy. Under five minutes most nights usually means you are short of sleep; over thirty most nights is worth addressing properly.
    Should I nap?
    A short early-afternoon nap is fine for most people. Long or late naps eat the sleep pressure you need at bedtime, which is exactly the problem you are trying to solve.
    Is breathing better than a sleep app?
    It is a component, not a competitor. The intervention with the best evidence for chronic insomnia is CBT-I; slow breathing is one of the arousal-reduction tools inside it and it is free.
    Why am I tired all evening and awake in bed?
    Usually because the evening tiredness was sleep pressure arriving during a low-stimulation hour, and getting into bed raised arousal — light, screens, and the anticipation of not sleeping. That is what the wind-down hour is for.

    What this page is built on

    • — Trauer et al., 2015, Annals of Internal Medicine — meta-analysis of CBT for chronic insomnia
    • — Bootzin & Epstein, 2011, Annual Review of Clinical Psychology — stimulus control instructions
    • — Zaccaro et al., 2018, Frontiers in Human Neuroscience — slow breathing and pre-sleep arousal

    Named by author and year. The DOIs live in the journal.

    Put a number on it

    Most of what is on this page tracks one measurement: the Control Pause. It takes sixty seconds, needs no account, and it is the thing that tells you whether any of this is working.

    Take the free test

    Go deeper

    From the journal

    Sleep and the night

    Falling asleep, waking at three, and the hours you spend tired but wired. All topics