I use my IPads a ton before bed and sometimes wake up with them pressed between me and the mattress. Usually it is really warm from being on playing a long video and body heat etc. and could totally imagine one being bent. I lay my Air on a flat surface to see if it was bent at all and there is a very slight concave that runs through the width about a millimeter in depth - I assume from me laying on it. After seeing your iPad I have decided to take better care when using my iPad before falling asleep!