Sleep is when the brain consolidates memories and clears metabolic waste. In the Whitehall study, people who slept six hours or less in midlife had about a 30% higher risk of later dementia (Sabia 2021). And in large cohort data, sleep regularity — consistent sleep and wake times — predicts health and longevity even more strongly than total hours (Windred 2024).
THE 3·2·1 WIND-DOWN
A simple heuristic that pulls together the strongest evidence — eating too close to bed and late-evening light both disrupt sleep:
3hours before bed — stop eating. Meals close to bedtime measurably worsen sleep.
2hours before bed — stop big drinks. Fewer late fluids means fewer night-time bathroom trips.
1hour before bed — screens off, lights low & warm, do your wind-down. Dim, warm light protects melatonin.
🛏️ WHICH POSITION SHOULD YOU SLEEP IN?
There's no single best position for everyone — the right one depends on what you're dealing with. Where the evidence is actually strong:
Snoring or sleep apnea → sleep on your side. On your back, the tongue and soft tissue fall back and narrow the airway. This "positional" effect is well established, and shifting to your side measurably reduces apnea and snoring for many people.
Acid reflux / heartburn → left side. Sleeping on your left keeps the stomach below the esophagus; it's linked to fewer night-time reflux episodes than the right side or your back.
Late pregnancy (3rd trimester) → settle to sleep on your side. Large studies link going to sleep on your back after 28 weeks to a higher stillbirth risk. Either side is fine; if you wake on your back, just roll back over.
Back or neck pain → whatever keeps your spine neutral, with support: on your back, a pillow under the knees; on your side, a pillow between the knees; and a pillow height that keeps your head level, not tilted.
Stomach sleeping is the one to avoid if you can. It holds your neck rotated for hours and flattens your lower back — a common source of morning stiffness. If you love it, use a very thin pillow (or none) and tuck one under your pelvis to ease the strain.
One honest note: apart from apnea, reflux, and pregnancy, most position advice is really about comfort and a neutral spine — the hard-outcome research is limited, so the best position is largely the one that lets you sleep pain-free through the night.
Sources: positional therapy for obstructive sleep apnea (AASM literature); left-side sleeping & GERD (review, World J Clin Cases 2023); sleep position & stillbirth (Cronin et al., EClinicalMedicine 2019; Tommy's / NHS guidance).
🧠 CAN'T SHUT YOUR BRAIN OFF?
When the lights are off but your mind won't stop, these give it a calm, neutral task instead. Tap one to try it. Each note says, honestly, how well it's actually backed by research.
Progressive muscle relaxation
Starting at your feet, tense one muscle group hard for about 5 seconds, then let it go completely and notice the release. Move up the body — calves, thighs, stomach, hands, arms, shoulders, face — breathing slowly out as you release each one.
Evidence: the strongest here. It's a core part of CBT-I, the first-line treatment for insomnia, and a 2022 study found it deepened slow-wave (deep) sleep.
The "military" relaxation method
Relax your whole face, including jaw and the muscles around your eyes. Drop your shoulders, then your arms. Exhale and let your chest loosen. Relax your legs, thighs down to feet. Then, for ~10 seconds, picture one calm scene in detail (a still lake, a dark quiet room) — or simply repeat "don't think." If a thought intrudes, let it pass and return to the image.
Evidence: popularized by a 1981 performance-coaching book, so the "asleep in 2 minutes" claim is anecdotal — but the parts it's built from (muscle relaxation and calm imagery) are the research-backed ones.
4-7-8 breathing
Exhale fully through your mouth. Inhale quietly through your nose for a count of 4. Hold for 7. Exhale slowly through your mouth for 8, with a soft whoosh. Repeat about four cycles. Keep the counts comfortable — the long exhale is the active part.
Evidence: slow, extended exhales nudge your nervous system toward its rest state. Direct sleep studies are small, so treat it as a calming wind-down, not a guarantee.
Cognitive shuffling
Pick a neutral word and go letter by letter. For each letter, slowly picture a few random, unrelated objects that start with it — B: boat, button, bridge… — with no story connecting them. When your mind wanders, drift to the next letter. The randomness blocks the anxious, logical thinking that keeps you awake.
Evidence: a newer idea from sleep researcher Luc Beaudoin. Only lightly studied so far, but low-risk and well-suited to a mind that won't stop narrating.
Paradoxical intention
Stop trying to fall asleep. Lie still, comfortable, and gently try to stay quietly awake instead — no screens, no getting up, just calm wakefulness. Often sleep slips in on its own once you stop chasing it.
Evidence: a recognized CBT-I technique. It works by removing the performance pressure — the "I have to sleep now" anxiety — that keeps many people awake.
If sleeplessness lasts for weeks, these techniques are part of CBT-I — the first-line treatment worth asking a clinician about.