I have read that some people can't sleep on this mattress. I had a pillow top mattress for about 14 years. Finally broke down and purchased new beds. Do to our age we went with adjustable beds and these 12 inch mattresses. It is soft but you don't sink down all that much. I have been using maybe 3 weeks now and do to no space on side of bed I get on from end. I have not hit the mattress retainer once yet the edges have some Good stability to them so you don't sink in that far. I fall asleep before the message function times out (15 minutes or so) and have slept past the alarm 2x so far. I find the bed incredibly comfortable but I am a heavy person. Over 300lbs. A lighter person might find it a bit stiff and unforgiving. Mind you the wife is over 100 but under 200 that is all I am allowed to say and she says it is very comfortable for her also. Our mattresses touch but I don't feel her turning over and she doesn't feel me turning over. But her snoring is still as loud as any freight train. Purchased deep fitted sheets and wake up with a corner off every morning, but that might be me finding comfy position with adjustable bed. Oh ya also they work very well with adjustable bed. They bend not crease or kink. The cover that is on the mattresses has a zipper so it can be either washed or dry cleaned, I'll have to find instructions or look on label. I am a side sleeper also as is wife and no problem holding position and shoulder sinks in a bit but not a lot. One final thing we both will get on one mattress to just watch TV or snuggle and well the old pillow top because she lite and I am not she would either lay on angel or I would get sore from her weight pressing on me because of how far mattresses was sunk down. NOT ANY MORE!!!! Now we lay beside each other and 1 I am not sunk in 6 inch (ya it was time for new bed ) any more so she is beside not above fallin into the sinkhole. Oh yes another important thing was that there was almost no smell when the mattresses opened which was surprising and it only took about 1 hour for them to get to full height or so they looked full height. And as you can see from the video that I included the sex is fantastic on this mattress. Haha ya perv there is no video you will have to find that stuff out on your own. We are very satisfied with this purchase we just wish we would have done it a lot sooner. Oh ya I have not woke up with a sore back since getting this bed and mattress.