Here are a few questions... What size mattresses have you used (twin, full, queen, king, etc)? What type (and brand name) of mattresses have you used (futon, pillowtop, regular, Tempur-Pedic, Sleep Number, etc)? What vibrating alarm clock have you used? When used altogether, what was your experience with them? Did one mattress work better than another when used with alarm clocks? Did one alarm clock work better when used with mattresses?