Tim from Imagitronics has created a cool alarm clock that was just a concept till he spent a few dollars on some parts and created it.
“Several months ago, I stumbled across an interesting article on halfbakery.com about the possibility of an alarm clock in which the alarm only sounds when the user is actually lying in bed. The idea peaked my interest a bit. Last week I decided to build just such an alarm. I picked up a cheap ($7) alarm clock and got right to work. The project essentially uses the internal mat from a Dell SK-8135 keyboard, a simple transistor-based NOT gate, a 4066 quad bilateral switch, a handful of resistors, and a current-smoothing capacitor.”