Weighted Blankets: What the Evidence Says

What the evidence shows

Small trials, mostly in people with anxiety, insomnia, or autism spectrum conditions, report reduced anxiety and improved subjective sleep. Samples are small, blinding is nearly impossible — you know whether you are under a heavy blanket — and effects on objective sleep measures are less clear. The honest summary: many people like them, some people benefit substantially, and the evidence is not strong enough to call it a treatment.

Given that it is a low-risk, non-pharmacological option, a trial is reasonable.

Choosing a weight

• The usual guideline is around 10% of body weight, plus or minus a kilogram or two.
• Heavier is not better — too much weight restricts movement and can raise temperature.
• Consider whether you move during the night; very heavy blankets can be claustrophobic for restless sleepers.
• Fabric matters: a breathable cover helps, since these blankets run warm. See best sleeping temperature.

Who should avoid them

• Infants and very young children — weighted blankets are not safe for infants and should not be used in a cot.
• Anyone with a condition affecting breathing or circulation — sleep apnoea, significant respiratory disease, or heart failure — should check with a clinician first.
• People with limited mobility who may not be able to remove the blanket easily.
• Anyone with claustrophobia or sensory aversion to pressure.

What it will not fix

A weighted blanket changes the input, not the sleep system. If you have chronic insomnia, it will not address diluted sleep pressure, the bed–wake association, or the catastrophic beliefs that maintain insomnia. See CBT-I.

A cheaper experiment

Before buying, try the mechanism: a folded heavy duvet, or a pillow placed firmly over the chest and thighs while lying down. If deep pressure clearly settles you, the purchase is more likely to be worth it. And if what you actually want is to stop feeling restless, try ten minutes of slow movement first — for many people the restlessness is background muscular effort rather than a need for pressure.