I have done all sorts of blood tests,nothing.I was diagnosed with sleep apnea but machine hasnt help.I went as far as getting ect treatments for depression because the doctor said i was depressed but it didnt help. This is going on four years and nothing has helped. I dont have a thyroid issue, or anything that has come up abnormal in the blood tests. I can sleep all types of hours but it makes no difference. All day its constant sleepiness, extremely low energy.