I think it works both ways simultaneously. I can run 1H30 in the afternoon, and go dancing until 4AM the same night, or go to bed at 10 and sleep like a baby.

I think it works both ways simultaneously. I can run 1H30 in the afternoon, and go dancing until 4AM the same night, or go to bed at 10 and sleep like a baby. Without exercise, I go to bed tired at 11 and can't sleep until 3 :)