Weighted Blankets Compared: Chain vs. Glass Bead and What Research Shows

Short answer: Weighted blankets get their weight from sewn-in metal chains or glass beads; the blankets tested in trials weighed 5.5 to 8 kg (about 12 to 18 pounds). [S01] [S02] Small trials suggest they can ease anxiety, including during chemotherapy infusions, and help some people sleep. [S03] [S06] But the evidence for sleep is mixed, most studies are small, and no study has compared fill types head to head. [S04] [S05] Weighted blankets are not safe for infants. [S07]

If you're spending nights in a hotel or a relative's guest room during treatment, comfort at bedtime matters. Here's what the research shows and how the main types differ.

What a weighted blanket does

A weighted blanket spreads gentle pressure across the body. Researchers describe it as a "deep touch pressure" tool, and it has been used to ease anxiety in many patient groups. [S06]

Chain vs. glass bead: how the types compare

The two fills studied most are metal chains and glass beads.

The two trials used different people, weights and measures, so their results can't be compared directly. In the Swedish trial's 12-month follow-up, participants tried two chain blankets and two ball blankets and chose whichever suited them best. [S01]

How heavy? There's no official guideline on how to use weighted blankets. [S05] The authors of the glass-bead trial noted that earlier studies suggested about 10% of body weight. [S02]

What the research shows for sleep

The strongest single trial comes from Sweden. 120 outpatients with depression, bipolar disorder, generalized anxiety disorder or ADHD, all with insomnia, used either a weighted metal chain blanket or a light plastic chain blanket for four weeks. [S01]

• 59.4% of the weighted blanket group had a meaningful improvement in insomnia, compared with 5.4% of the control group.
• 42.2% reached remission, compared with 3.6%.
• The weighted blanket group also had better sleep maintenance, more daytime activity, and less daytime fatigue, depression and anxiety. [S01]
• One participant stopped because the blanket made them feel anxious. There were no serious adverse events. [S01]
• At 12 months, after everyone had the option to use a weighted blanket, 92% were responders and 78% were in remission. That phase had no control group. [S01]

Its limits: participants all had psychiatric conditions, and the researchers acknowledged a risk that the outcome rater could learn which blanket a person had, which happened once. [S01]

The glass-bead pilot trial found a mixed picture. After a month, the weighted blanket group improved more on one sleep-quality scale. But insomnia severity and the number of night awakenings were not significantly different from a normal blanket. [S02] The weighted blanket group did report improvements in stress, anxiety, fatigue and pain. [S02] A few people dropped out, including one who felt cold and four who changed where they were sleeping. [S02] Its limits: 82% of participants were women, results were self-reported, the trial was registered after it began, and it was partly funded by the company that made the sleep-tracking devices. [S02]

Pooled results are more cautious. A 2024 meta-analysis of eight randomized trials found the insomnia effect was not statistically significant. Half of the trials had a high risk of bias, mainly because participants knew which blanket they had. [S04] A 2024 scoping review of 18 studies found generally positive results in adults, mixed results in children, and variable study quality. [S05]

The main studies at a glance

In adults, the scoping review found reports of better sleep, improved mood and reduced medication use. In children and teens, sleep results were mixed, though some showed better everyday functioning. [S05] The authors called for practice guidelines, noting that none exist yet. [S05]

What the research shows for anxiety

Anxiety results are more consistent:

• A 2024 meta-analysis of nine studies with 553 psychiatric patients found weighted blankets improved anxiety symptoms compared with placebo. [S03] The studies covered people with depression, bipolar disorder, ADHD and autism, and blanket use ranged from 5 minutes to a year. [S03] The authors cautioned that the research is limited by small samples and few well-designed trials. [S03]
• The eight-trial review also found a small reduction in anxiety. Studies it could not pool reported benefits for fatigue and depression. [S04]

None of these reviews focused on people with cancer. [S03] [S04]

Weighted blankets during chemotherapy

One study looked specifically at people with cancer. In a randomized crossover trial at an outpatient infusion center, new patients used a medical-grade weighted blanket during either their first or second chemotherapy infusion. Anxiety was lower when they used the weighted blanket. [S06]

That's encouraging, but it was a single study, and the published abstract doesn't report how many people took part. [S06] The larger sleep trial excluded people with cancer and other major diseases, so its results may not apply during treatment. [S02]

Who should be careful

• Infants: The American Academy of Pediatrics says weighted infant sleep products are unsafe. The U.S. Consumer Product Safety Commission urges parents not to use weighted blankets or swaddles for infants. [S07] A CPSC commissioner said these products are associated with concerning drops in infants' oxygen levels, and retailers including Amazon, Target and Babylist said they would stop selling them. [S07] The AAP advises that weighted products not be placed on or near a sleeping infant. [S07]
• Children and older adults: The glass-bead trial's authors urged caution for children and elderly users. They advised against covering the face, and suggested that frail older adults use the lightest blanket after consulting a clinician. [S02]
• People who feel anxious under weight: In the Swedish trial, one person stopped for this reason. [S01]
• During cancer treatment: Of the studies above, only the infusion-center trial involved people with cancer, and it tested use during infusions, not overnight. The glass-bead sleep trial excluded people with cancer. [S02] [S06]

Using one away from home

If you travel for treatment, keep in mind that the blankets studied weighed 6 to 8 kg in the Swedish trial, and one participant's metal chain blanket set off an airport metal detector. [S01]

For other ways to rest better in an unfamiliar room, see our hotel-room sleep checklist. If stress is keeping you up, our guide to simple daily habits for managing stress may help too.