I feel like a baby that has their days and nights reversed. I can barely crawl out of bed in the morning. I am a teacher and I can hardly keep from yawning through all my morning classes. In the afternoon I am also tired and I sometimes can barely stay awake to drive home. Then about 9 at night when I should be going to sleep I start to wake a little bit. This is so different from my typical self. I have always been an early to bed, early to rise person. I was always at my best in the mornings and did start to wear down in the afternoon and ready to sleep at night but now it so different. All day I am exhausted..then for about 2 hours at night.beginning at 8 or 9..I have some energy and then of course I don't sleep well either anymore. Why the change in my pattern?