I have insomnia for the most part, and when I don't sleep I tend to be okay for a day or two. Last night though, I did sleep, but I woke up exhausted and have been for the whole day. Whenever I sleep I wake up feeling like I have been punched in the face and don't have much energy throughout the day. Why is that? Usually, if I am tired I pick-up by late afternoon and tend to be more wide awake, but today with sleep I feel exhausted and it is 7pm.