Yep. It shut itself off after 20 seconds. The vibration isn't overwhelmingly powerful, which is GOOD - although it might just be that the triple A battery I used (not included) was old and weak. Lucky we even had ONE in the house!

I happened to already be awake at the time the alarm vibrated thanks to the callousness of my daughter and her idiot friend who let themselves into my house drunk at 1:00am, then proceeded to talk and walk around the house until 3 am. I was so annoyed I couldn't fall back to sleep, and was still awake at 4am when the vibe happened.

On the PLUS side, I fell asleep eventually, had two awesome long dreams with excellent recall. No lucidity, unfortunately.

I'm gonna exploit this tool. I hope people will suggest possible ways to use it expressly for LD purposes.

DH