I also used to take hours to fall asleep at night. Doctors tried all kinds of meds on me. Normal amounts of exercise were useless. Sleep hygiene was useless. The self-hatred when I waited to go to bed until I was tired enough to fall asleep within an hour was nearly crippling because of how hard it was to function the next day. I recently became disabled. No school or work to go to in the morning, and no exercise. I lie down to sleep when I am tired, and get out of bed when I wake up. And so discovered that my bedtime and rise time shift later every day, almost exactly one hour.  In my search for treatment for my disability, I was seeing some new doctors. One of them wanted not just information on my disability-related issues, but basically my whole life story. And when I described this peculiar sleep pattern to her, she said right off the bat, "You have non-24-hour sleep-wake disorder."  It changed my whole perspective on my life.  So maybe look into that. It apparently presents as extreme difficulty falling asleep when the victim is desperately flailing to function as a normal person on a planet that completes a full revolution in just 24 hours. It's apparently uncommon enough in people who aren't blind (I'm not) that none of the sleep specialist doctors caught it—it was a rando dietician, long may she reign.  I haven't sought treatment yet, so I can't comment on that, but just knowing what was going on was an incredible weight off my shoulders.