No problems with the sheets. This one is supposedly different than the other pedic type beds in a few ways. It's more supportive so you don't just get that "sink and can't move" experience, which may have been also causing the sheet issue. It has just enough sink to get comfy where you don't want to move but still can should you choose too. It also has that cooling gel so you don't get hot, which is the tendency of memory foam. I've slept on a temperpedic before and found it to be quite uncomfortable for the reasons I just listed. With this mattress I can usually just close my eyes and open them again 8-9 hours later. (that's what it feels like anyway) Pretty remarkable considering my previous insomnia issues.