Jeff’s “Princess and the Pea” alarm clock takes a cue from a classic fairy tale to provide a not-so-subtle wake-up call -

No ordinary alarm clock: the Princess and the Pea Alarm Clock (“PPAC”) leaves no room for snoozing, inflating a green “pea” between the mattress and box spring, making it impossible to stay in bed. In the tin can, a homemade Arduino-compatible board with clock and memory chips handles the alarm clock functions, and a power block under the night stand provides power and relays driving the sprinkler valve or other alarming alarm functions.

Looks rather effective – can’t wait for the travel version! See more on Jeff’s Arduino Blog.