I use my cellphone alarm to wake up (with vibrate on), and have noticed that i almost always half wake up just from the sound of the vibration on my table, before the alarm has even sounded.

Tonight i will try setting a 'timer', with my phone on silent, after about 5 hours of sleep. This will result in just the vibration and no sound. I will try to wake up without moving my body, and if successful i may become lucid.

I will post results.