I am 5ft 8inches and about 230 lbs. I wanted to try a different type of bed as I had a old spring mattress so I got this one (and it was much more expensive back then). It took some time getting used to, as it is still warm, even with the "Cool sensations" Also, it does not bounce at all...you sink in after a few minutes. After sinking in, you pretty much don't move the rest of the night, because it would take a conctrated effort to move, since you've sunken in. When I wake up in the morning, I realize that I haven't moved all night and that my rear end is basically touching the boxspring because I've sunken in so much. This is where the bounciness comes into effect...normally I'd be able to kind of rock myself out of bed and be able to 'bounce' out, but in this quicksand type bed, I have to really put some effort in getting out of bed. Obviously have not moved all night leaves me a little sore and stiff as well. Side note: I apologize for being crude but this is definitley something I've noticed as well. This bed, again due to the sinking, quicksand-like feel, doesn't lend it self well to procreation.