Actually, not much! I sleep very well most nights and fall asleep within a few minutes of my head hitting the pillow, but occasionally (about once a month) I will go to bed about 10:30pm and wake up about 2:00am and I am wide awake and cannot go back to sleep. I usually try to fall back to sleep but if I don't fall asleep within 30-45 minutes, I wll just get up, fix breakfast and assume I am up for the day. Of course about 6:00am I am starting to get sleeping...:grin:
Not a problem now that I am retired, but really made for a long day when I was working since I would normally get up at 6:00am.
Usually the next night I would go to bed 30-60 minutes early and sleep all night long and caught up with any missed sleep from the previous night.