I have to take my antidepressents at night and Super combo or Stress B vitamins in the morning to wake up or I have the same problem. It was especially bad when I changed to Lexapro. I was exhausted for over two months and could easily take 30 minutes or more to get out of bed. If I sat still, I could fall asleep. I just know I have to take B6-12, combination Vitamin and I crash about lunch time and have to do it again. Maybe you are needing some sort of supplement?