You know I find it really irritating that I can go to bed exhausted, toss and turn all night, and then wake up exhausted the next day. How can you go to bed tired and not be able to sleep? Surely your body and mind are aware of the situation and should be working toward the common goal of getting enough rest.
What irritates me even more is when you toss and turn all night, and then suddenly fall into a deep and peaceful sleep about an hour before the alarm goes off. Then you actually wake up more tired than you were when you went to bed! You have to be thinking what was the point. What a waste of time. You could have stayed up all night and felt exactly the same way. Why did you waste 8 hours laying in the bed being unproductive?