A weighted blanket is one of the few sleep tools with randomized-trial data behind it. The five blankets worth owning, the 10-percent-of-bodyweight rule, glass-bead vs plastic-pellet fill, and where the evidence stops.
Questions logged on this protocol
Do weighted blankets actually help you sleep?
The evidence is modest but real, and stronger for anxiety-linked insomnia than for otherwise healthy sleepers. Ekholm et al. 2020 (J Clin Sleep Med) randomized 120 patients with a psychiatric diagnosis and insomnia to an 8 kg chain blanket or a light control; the weighted group was nearly 26 times more likely to reach a substantial drop in Insomnia Severity Index over four weeks. The proposed mechanism is deep-touch pressure raising parasympathetic tone and lowering pre-sleep arousal, which shortens the time it takes to fall asleep. The effect is on sleep onset and subjective quality, not on sleep architecture stages themselves. For the mechanics of why arousal keeps you awake, see our piece on sleep onset latency.
How heavy should a weighted blanket be?
The common rule is roughly 10 percent of your body weight, which is also close to the load used in the trials that showed a benefit (the Ekholm 2020 blanket was 8 kg, about 12 percent for a 70 kg adult). For a 150 lb adult that points to a 15 lb blanket; for a 200 lb adult, 20 lb. Round to the nearest available weight rather than overshooting. Too heavy is a real failure mode: a blanket that feels trapping raises arousal instead of lowering it, and can make hot sleepers wake more. If you are between sizes, size down.
Glass beads or plastic pellets?
Glass beads. They are smaller and denser than plastic poly-pellets, so the same weight sits in a thinner, flatter, quieter layer that distributes pressure more evenly and traps less heat. Plastic pellets are cheaper but bulkier, noisier when you move, and warmer. Every blanket in this ranking except the knit Bearaby uses glass-bead fill for that reason. If a listing does not state the fill type, assume pellets and treat it as a budget compromise.
Will a weighted blanket make me too hot?
It can, and that matters because sleep depends on your core temperature falling by roughly 0.5 to 1 C at night; anything that blocks that drop tends to fragment sleep. The heat problem is mostly the cover, not the weight: fleece and minky shells trap heat, while quilted cotton shells and open-knit blankets breathe. Hot sleepers should choose the Bearaby knit or a cotton-shell blanket like the Baloo, keep the bedroom near 18 C, and remove any included fleece duvet cover in summer. If you consistently wake sweating, the blanket is working against you.
Who should not use a weighted blanket?
Do not use them with infants or toddlers, who cannot reliably push the weight off, and be cautious with anyone who has obstructive sleep apnea, chronic respiratory disease, low blood pressure, or claustrophobia. If breathing already feels effortful lying down, added chest load is the wrong intervention. This is general information, not medical advice; if you have a diagnosed sleep-breathing condition, ask your clinician first. For breathing-related sleep symptoms, start with our overview of sleep apnea symptoms rather than a blanket.
Is a weighted blanket better than melatonin or magnesium?
They act on different problems, so it is not a straight contest. A weighted blanket lowers pre-sleep physiological arousal through deep-touch pressure; low-dose melatonin shifts the timing of the circadian clock; magnesium glycinate supports GABA-A signaling. If your issue is a racing, wired feeling at lights-out, the blanket is the most direct lever. If your problem is a mistimed clock, see melatonin dosing. If it is general sleep-onset support, compare with our best magnesium for sleep guide. Many people who sleep poorly stack the blanket with one supplement rather than choosing.
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