Does anyone have any experience with these and if they actually make a genuine difference to how well you sleep?
It's supposed to trigger the sleep you got as a child wrapped up in a blanket or being held. It seems to work for some people. I don't like even a quilt too tight around me or hanging off the bed where it will weigh down on me, the wife however will often be found wrapped like a sushi roll, or with the quilt piled in the middle of the bed and herself parked on top of it.
You don't really know if it will work until you try it, though maybe you could see if a heavy blanket or one tucked in tight on the bed improves your sleep.