I'm using my Mobiles as a Alarmclock in the morning... and every day I'm pressing 2 or 3 times the Sleep mode. At the N900 with the Touchscreen it is in my opinion to easy to turn it off early in the morning.
Edit:
Insight: We need a solution for every programm that unlocks the device itself.
So a another Brainstorm was created related to this. A common UI change is needed. Not only on application level. Please VOTE here.