I read the reviews before I purchased, regarding not totally getting to a full expansion. What I mean is staying flat is some areas. Well I was lucky it took only two hours to get fully uncompressed (if that's a word). Since I've used this product I am sleeping through the night. I have RA, so pain in my shoulders and hips at night make me totally uncomfortable. So take that chance and sleep all night for once, you'll be totally surprised.