I'm an insomniac and haven't been able to sleep longer than 2 hour stretches. BUT I know the value of laying in bed quietly without moving as it recharges my body and allows it to get the rest that it needs. So for me, what's the point of no return - when my alarm goes off. If I get up any earlier than that, regardless of how long I've been awake prior, I'm only hurting myself because my body needs that time to just lay still and in the quiet so that I'm not dragging that day.
