You've invented a new alarm clock called the ""Rude Awakening."" What does it do?

So I'm deaf and I'm subject to this regularly. My alarm is connected to a disc that I place under my mattress. The disc vibrates violently when the alarm goes off, waking me up. I've been conditioned to wake up before my alarm most days, but occasionally I'll be in the middle of REM sleep and it'll go off. Talk about a rush. Edit: Lots of people asking what I use: Sonic Bomb. You can find it on Amazon. I've posted it in the comments (or in my post history). Should be about $30-40. Keep in mind it draws power from your wall outlet (not battery-operated), which means that if your power goes out overnight your alarm will not go off on time.