I have an issue keeping my sheets on my bed, they like to wrinkle up and come undone and i have to put them back on every night, or at least i used to. Now I just opt to take another blanket and lay it on top of my sheetless bed and adjust it every so often. I know there are matresses that come with the sheets sown in place or other kinds called pillow tops, but im a cheap bastard and don't feel like i should ever have to use any other bed than the one i've been using all my life. Which so happens to have a very irratating coarse texture to it.
any ways, how does every one else deal with their sheets coming off the bed all the time, or how do you prevent it?