The first few nights sleep were so profoundly different than sleeping on any other mattress I could not lay down without falling asleep. I got a twin for the guest room to stay in while I recovered from major surgery. I haven't gone back to my king bed yet. I would have already replaced my king with a Helix if they took away old mattresses. It is an inconvenience to call junk removal, but worth it. I melt to sleep every night.