Hard-Core Sleepers Obsess over Their Snoozing Stats

Two factors matter for me more than the others: (1) no alcohol, (2) time I go to bed. I find if I go to bed earlier my sleep quality and not just quantity is better. I am monitored by both a Garmin watch and a CPAP machine.

Sometimes I love starting a "small" technical project at 10:00 pm that I think will be done at 11:00pm but it isn't until 12:30am that I wrestling it into submission but I find it takes a long time to settle after that.

My experience and findings match yours. Sleepyhead is great software for analysis of machines.

https://gitlab.com/sleepyhead/sleepyhead-code

https://archive.ph/Fkyzy

This is part of something bigger called the "quantified self.".