My best routine was when I went to sleep when it was dark and woke up when it was dark. I went to sleep at the same time every night. What was amazing was that

My best routine was when I went to sleep when it was dark and woke up when it was dark. I went to sleep at the same time every night. What was amazing was that I would wake up at the time every morning, within like 10 minutes. Then at the time to sleep, I would be too tired to keep my eyes open. I wish I would have documented this better, but I believe it was close to 8 hours (a little more or a little less. My thinking was that waking up when there was light, would mess with my sleep. The light might wake me up earlier than I would otherwise, acting as sort of an alarm clock. It's just hard because it meant that I was sleeping at like 8PM.