Studies have shown the positive impact provided by weighted blankets for those with ADD, Autism, PTSD, insomnia, and anxiety. The Deep Touch Stimulation provided by a blanket 8-12% of your body weight produces a swaddling effect that helps regulate moods and promotes sleep by increasing serotonin and melatonin.
Weighted blankets are also suitable if you have a busy brain, have trouble falling asleep, like to snuggle or could simply use another hug.
There is real science behind this:
How much weight do you recommend?