Weighted blankets

Weighted blankets have gone from an occupational therapy tool to a bedroom staple in the space of a few years. The idea is simple – gentle, even pressure across the body, similar to a hug. Whether the evidence backs the marketing is worth thirty seconds, before you buy.

The evidence, briefly

Weighted blankets work on a principle called deep pressure stimulation. The theory is that firm, even pressure calms the nervous system in a way similar to swaddling a baby, or a firm hug.

It’s been used clinically since the 1970s, originally with autistic children and people with sensory processing needs, long before it reached the wider wellness market.

The research on anxiety specifically is modest but real. A widely cited University of Massachusetts study had thirty-two adults sleep under a 13.6kg blanket, and just under two-thirds reported feeling calmer afterwards.

A separate small study following twelve people with insomnia, pain or stress found their cortisol – the main stress hormone – had started to normalise after eight weeks of use.

A 2024 systematic review pooling several randomised trials found a small but genuine reduction in anxiety symptoms. The same review found no significant improvement for insomnia specifically, and noted many of the underlying studies were fairly small and not always well blinded.

Worth knowing plainly: this isn’t a cure, and it isn’t going to touch a clinical anxiety disorder on its own. It’s a low-risk, low-cost way to potentially take the edge off at bedtime – closer to a good pillow than to a treatment.

How to try it

Weight matters more than material. The general rule is around 10% of your body weight – so roughly 6–7kg for a 65–70kg adult.

Too heavy and it’s uncomfortable or restricts movement in bed; too light and you won’t feel the pressure effect at all.

Cover from shoulders to feet, not tucked round the neck. Glass bead or plastic pellet fillings distribute weight most evenly.

Some are effectively unusable in a UK summer without a breathable cotton or bamboo cover, so check the tog rating if you run warm at night.

Not recommended for young children, or for anyone who can’t easily remove a heavy blanket unassisted – there’s a real, if small, suffocation risk that’s worth taking seriously rather than dismissing.

Where it comes from

Deep pressure therapy has roots in occupational therapy going back to the 1970s. It stayed within specialist and special-needs communities for two decades.

A wave of direct-to-consumer brands repositioned it as a general sleep and stress product in the late 2010s – Time magazine named it one of its top fifty inventions of 2018.

That’s worth knowing simply because it explains the gap between the modest clinical evidence and the much bolder marketing claims you’ll see on Amazon reviews.

Worth knowing

1. The effect is real but modest. Expect “slightly calmer,” not “anxiety solved” – the research shows a small effect size, not a dramatic one.
2. Sleep and anxiety aren’t equally supported. The calming effect has better evidence behind it than the insomnia claims specifically.
3. Price doesn’t reliably track quality. A mid-range option with the right weight for your body will usually outperform an expensive one with the wrong weight.
4. This sits alongside proper support, not instead of it. If anxiety is significantly affecting your day-to-day life, a blanket is a small addition, not a substitute.

Worth trying

Two UK-available options, one considered, one budget-friendly.

Sources: University of Massachusetts sleep study (deep pressure stimulation, self-reported anxiety); cortisol/stress cohort study; systematic review and meta-analysis of RCTs on weighted blankets, mental health outcomes (2024). Full references on the sources page.