my therapist suggested one. i was dubious. before i even looked online (and saw they can cost $200!!!!) i looked around my house and came up with a super old, heavy sleeping bag (musty and smelly, but i'm a guy so it's fine), and old blue 'moving mats.' movers use them to move things, to protect the objects, like, say a piano mover..... i tried all that, just covering myself, and nearly suffocated and died from the weight... ok, it was only 15lbs or so. so next night i try just the old sleeping bag, 7 lbs. felt good! i felt safer.
anyone else? i'm going to continue trying this experiment, as long as it feels good. and of course, cost? zero.
happy and healthy december all....