Just thought I'd share my experience with mine as I know they're hideously expensive things just to take a punt on. It's really helped with my nighttime anxiety. I also fall asleep faster, and wriggle less during the night. I don't necessarily sleep for longer, or not wake up in the night, but it does improve the quality of my sleep. I have ASD and it's great for grounding me if I'm very anxious. On the down side it's very heavy to move about (I went for an 11lb one) but that's a minor consideration. I bought mine on amazon and it was £140