Years ago, as part of sensory therapy, our son needed to have a heavy blanket. It was part of his occupational therapy for his Autism. When it was explained how sleeping under a heavy blanket has a calming effect on the person and the fact that this weight had an impact on all the large muscles. It not only wrapped the person in a close hug, it provided passive therapy at the same time. Little did we know when we were doing this how beneficial it would turn out to be.
Long Arm quilter I have met recently, showed me what she makes for this very reason, what she makes can be used during the day and she did not know just how well the therapy actually works, until I shared with her what it did for our son.