Is a Heavier Weighted Blanket Better? 7, 9 and 14 kg Tested

Not on the evidence so far. In a new pair of randomised trials from Greece, healthy young adults slept or napped under 7, 9 and 14 kg weighted blankets, and none of the loads clearly changed what the sleep sensors recorded. What did shift was how relaxed people felt and a few signs of a calmer body, which fits the idea that deep pressure works more on how you feel at bedtime than on one night of brain wave data.

The study: three loads, two settings

Researchers at the University of Thessaly published two linked crossover trials in Healthcare in October 2026. Each enrolled 20 healthy adults, average age 22, and each person tried every condition one week apart.

• Nap trial: 30 minutes lying down in a lab under a light cotton blanket, 7 kg, 9 kg or 14 kg.
• Overnight trial: a full night at home under the person's own blanket, 7 kg, 9 kg or 14 kg.

Sleep was scored with a portable EEG headset. The team also tracked relaxation questionnaires, grip strength, heart rate, blood pressure, and skin and bedroom temperature. The study had no external funding and the authors report no conflicts of interest.

The blankets were fixed commercial weights rather than matched to body size. With an average body weight of about 68 kg in the overnight group, that works out to very roughly 10%, 13% and 20% of body weight.

What the sleep data showed

| Overnight condition | Sleep efficiency | Minutes to fall asleep | Chest skin temperature | |---|---|---|---| | Own blanket | 79.4% | 34.3 | 26.6°C | | 7 kg | 86.4% | 10.9 | 26.2°C | | 9 kg | 89.2% | 19.6 | 25.4°C | | 14 kg | 88.0% | 16.8 | 25.2°C |

The averages look like a win for weighted blankets, but none of these differences was statistically significant. With 20 people and wide night-to-night swings, a gap of this size can easily be noise.

The one result that reached significance was "sustained sleep efficiency" under the 9 and 14 kg blankets. It rested on only seven people with complete data, and it vanished when the researchers ran two alternative analyses. The authors call it exploratory and say plainly that the study does not show weighted blankets improve objective sleep. In the nap trial, no sleep measure differed between conditions at all.

Where the nervous system did respond

The body signals were more interesting than the sleep scores:

• Relaxation rose in every nap condition, with the biggest increase under the 9 kg blanket (about 20%, against about 18% under the light blanket).
• Grip strength dropped after every weighted condition, which the authors read as a sign of lower muscle tone or arousal.
• Heart rate and systolic blood pressure fell during naps under the light blanket and the 7 kg blanket. Under 7 kg, heart rate dropped about 5.7% and systolic pressure about 4.9%.
• Overnight, systolic pressure fell about 4.3% after sleeping under the 9 kg blanket, with no change in heart rate.

So more weight did not mean more calm. The middle loads did as well as or better than the heaviest one, and the light cotton blanket also helped people unwind during a nap.

How this fits earlier research

This pattern of "feels better, measures the same" keeps showing up.

• A 2014 trial in Pediatrics gave 67 autistic children with severe sleep problems a weighted or normal blanket for two weeks each. Actigraphy showed no gain in total sleep time, but children and parents preferred the weighted blanket.
• A 2023 Uppsala lab study had 26 young adults sleep under a blanket of about 12% of body weight versus about 2.4%. Melatonin rose about 32% more in the hour before lights out, but sleep duration, cortisol and sleepiness did not differ. We covered it in our piece on weighted blankets and melatonin.
• A 2020 trial in the Journal of Clinical Sleep Medicine is the strongest positive result. It followed 120 adults with depression, bipolar disorder, generalised anxiety or ADHD for four weeks and found large improvements in insomnia scores with a weighted chain blanket versus a light one. More in our look at adult insomnia trials.
• A 2020 systematic review in the American Journal of Occupational Therapy found only eight studies and concluded weighted blankets may help with anxiety, but the evidence for insomnia was thin.

One reading: a single night under a new, heavier blanket is a weak test. The clearest gains so far come from weeks of use in people who actually had trouble sleeping, not one night in healthy 22 year olds.

What about heat?

Many people worry a heavier blanket will make them hotter. In the Greek overnight trial, skin temperature on the chest and thigh did not differ between loads, and the averages even drifted slightly lower under heavier blankets.

There's a catch. Those bedrooms averaged about 19 to 20°C. In Singapore, the Meteorological Service notes that night time lows usually do not fall below 23 to 25°C, with humidity often above 90% before sunrise, and indoor bedrooms can run warmer still, as we found in our look at Singapore bedroom temperatures. Heat also shows up in real life: in a 2026 US hospital study of weighted blankets, 17 patients declined to take part, citing reasons that included claustrophobia, past bad experiences and feeling too hot.

Practical takeaways

1. Heavier is not automatically better. Starting around 10% of body weight remains a sensible default, as explained in our guide to the 10% rule. The 9 kg blanket did no worse than the 14 kg one here.
2. Judge it over weeks, not one night. The positive clinical results come from four weeks or more.
3. Notice how you feel, not just your tracker. The most consistent effects were feeling more relaxed and a calmer body, not a higher sleep score.
4. Manage heat in a warm room. If you sleep hot, look at the surface fabric as well as the weight. A cooling weighted blanket with a phase change knit surface, like the one detailed on our specifications page, is one way to pair pressure with heat relief.
5. See a doctor for ongoing insomnia. A weighted blanket is a comfort tool, not a treatment. Weighted blankets are also not safe for infants or very young children.

Sources

1. Ntoumas I, Antoniou N, Bourganos N, et al. Weighted Blanket Load and Sleep Outcomes During Daytime Napping and Overnight Sleep: Two Randomized Crossover Studies. Healthcare. 2026. https://doi.org/10.3390/healthcare14203416
2. Gringras P, Green D, Wright B, et al. Weighted blankets and sleep in autistic children: a randomized controlled trial. Pediatrics. 2014;134(2):298-306. https://doi.org/10.1542/peds.2013-4285
3. Meth EMS, Brandão LEM, van Egmond LT, et al. A weighted blanket increases pre-sleep salivary concentrations of melatonin in young, healthy adults. Journal of Sleep Research. 2023;32(2):e13743. https://doi.org/10.1111/jsr.13743
4. Ekholm B, Spulber S, Adler M. A randomized controlled study of weighted chain blankets for insomnia in psychiatric disorders. Journal of Clinical Sleep Medicine. 2020. https://pmc.ncbi.nlm.nih.gov/articles/PMC7970589/
5. Eron K, Kohnert L, Watters A, et al. Weighted Blanket Use: A Systematic Review. American Journal of Occupational Therapy. 2020;74(2). https://doi.org/10.5014/ajot.2020.037358
6. Rico C, Bhadu K, Callahan B, et al. Weighted Blankets to Reduce Anxiety in Hospitalized Patients. American Journal of Critical Care. 2026;35(5):362. https://doi.org/10.4037/ajcc2026793
7. Meteorological Service Singapore. Climate of Singapore. https://www.weather.gov.sg/climate-climate-of-singapore/