Weighted Blankets: What the Evidence Supports, and How Heavy to Go
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Weighted blankets are one of the few sleep products with a plausible mechanism and some actual trial data behind them. They are also widely oversold. Here is what the evidence supports, and how to pick a weight without wasting money.
The short answer. Roughly 10% of your body weight. The evidence is strongest for people whose sleep problem is anxiety or restlessness at bedtime, and weakest for people who fall asleep fine but wake at 4am. If you sleep hot, choose a cotton or bamboo cover and a lighter weight than the calculator suggests.
What the evidence actually says
The proposed mechanism is deep pressure stimulation: broad, even pressure across the body appears to shift autonomic balance towards the parasympathetic — the calming side — reducing arousal at the point where you are trying to fall asleep. It is the same principle behind swaddling an infant and behind the pressure vests used in occupational therapy.
A 2020 randomised controlled trial in the Journal of Clinical Sleep Medicine looked at insomnia in patients with psychiatric conditions and found the weighted-blanket group had significantly better insomnia scores at four weeks than the control group. Several smaller studies have found reductions in self-reported anxiety. The consistent pattern across the literature is that the benefit is real but modest, and it is largest for people whose sleep difficulty is anxiety-driven.
What the evidence does not support: weighted blankets as a treatment for sleep apnoea, restless legs, chronic pain, or ordinary sleep-maintenance insomnia. If your problem is waking at 4am and not getting back to sleep, this is probably not your answer.
Choosing a weight
| Your weight | Blanket weight | Notes |
|---|---|---|
| Under 45kg | 2.5–4.5kg | Do not exceed. Children need specialist advice. |
| 45–65kg | 5–6.5kg | The most common adult size. |
| 65–90kg | 7–9kg | Go lighter if you sleep hot or feel claustrophobic. |
| 90kg and above | 9–11kg | Above 11kg is rarely more effective, just harder to move. |
Two adjustments to the 10% rule. If you have never used one, go a step lighter — the sensation is more intense than people expect and a blanket that feels oppressive gets abandoned. And if you share a bed, buy two singles rather than one large one; a weighted blanket does not drape across two people who move independently, and a king-size weighted blanket is genuinely difficult to handle.
Approved partners relevant to this guide
These are the sleep-related programs currently shown as Joined in our Awin account. Partner status never determines the order of our advice.
Weighted blankets
Mosaic Weighted Blankets
Approved specialist weighted-blanket partner. Choose weight conservatively and make sure the blanket can be removed easily.
Sheets & bedding
Egyptian Linens
Approved US bedding partner. Compare fibre, weave, fitted-sheet depth and care instructions rather than relying on thread count alone.
Home textiles
Bella Maison
Approved partner for bedding and home textiles when the mattress is fine but the layers around it need attention.
Practical things to know
- Glass beads, not plastic pellets. Glass is denser, so the blanket is thinner and cooler for the same weight, and it is quieter. Plastic pellet blankets are bulkier and rustle.
- Look for baffled or pocketed construction. Small sewn compartments stop the fill sliding to one end. Blankets with large squares develop bald patches.
- Buy a removable, washable cover. Most weighted blankets themselves are difficult or impossible to machine wash. The cover does the work.
- They sleep warm. There is a lot of material against you. Cotton or bamboo covers, and consider dropping your duvet tog when you start using one.
- Give it two weeks. Most people find the first two or three nights strange. If it still feels oppressive after a fortnight, it is not for you.
Who should not use one
Weighted blankets are not appropriate for anyone who cannot easily remove the blanket themselves. That includes very young children — they are a suffocation risk for under-twos and should only be used with children under professional guidance — and adults with significant mobility limitations. They are also not advised with obstructive sleep apnoea, respiratory conditions, circulatory problems or claustrophobia. If any of those apply, check with a clinician first.
Common questions
Do weighted blankets really work, or is it placebo?
There is genuine randomised trial evidence for improved insomnia scores, particularly where anxiety is a factor. The effect size is modest rather than transformative, and a placebo component is likely — but that is true of most sleep interventions and does not make the benefit less real to the user.
Can I use one in summer?
Yes, with a cotton or bamboo cover, a lower duvet tog and a cooler room. Some people switch to a lighter weight for summer. If you already sweat at night, this is a product to be cautious with.
What if I share a bed?
Buy two single-size weighted blankets rather than one large one. Weighted blankets are designed to drape close to one body, and they do not work well shared.
Are they safe for children?
Not for under-twos under any circumstances. For older children, use a blanket sized to the child at around 10% of their body weight, and only after speaking to a paediatrician or occupational therapist — this is commonly recommended in an autism or ADHD context, but should be professionally guided.
How do I wash it?
Wash the removable cover regularly and follow the manufacturer instructions for the inner blanket, which usually means spot cleaning or a commercial machine. Most domestic washing machines cannot handle 9kg of wet blanket.
How we pick. We shortlist from retailers we have a verified commercial relationship with, then rank on construction, firmness accuracy, trial length and returns policy — not on commission rate. We are not a medical service; if pain wakes you every night, see a clinician before you buy a mattress.
