I purchased this mattress almost 4 months ago. I wanted to sleep on it several months before posting a review, as I think it is more helpful to others when reading reviews before a purchase. While this is a VERY comfortable mattress, it is supposed to be cooling all night, and I did purchase the cooling mattress cover, it definitely does not keep you cool. I've woken up many times per night, for many nights, hotter than Hades. I literally have to move to a whole other spot in the bed, luckily I got a king size! I've tried thinner blankets hoping that was part of the problem, but it is not the blankets, it's the mattress or cover holding the heat. It does not happen every night, fortunately, but it does happen quite often. My husband says he's noticed it also, but not as much as I do, he could sleep through a tornado. It is very comfortable though. I'm sure I'll enjoy it in the winter months.