I read this at 8:22 laying in bed waiting for my coffee to kick in and feeling drowsy - a daily drowsiness that only disappates after multiple days off where I can wake up with no alarm (i.e. vacation). Even if I try to sleep early, my sleep is choppy most of the night and requires being able to go back to sleep til 10 or 11. I have more energy at midnight than at 8a. There's no blue light or other trick, here, it's been like this since childhood.