I repeated the two things that remained on my list as possibilities for why I slept so well a few nights ago: 1. Looked at my face in a mirror a half-hour earlier than usual with a better sound source. 2. Stood on one foot until exhaustion (6 times). Lo and behold, I slept great. Now I’m pretty sure one of these two, or their combination, is responsible.
An unexpected twist is that I only slept 5 hours. Usually I’d still feel tired after that little sleep. But I feel like I slept 7 or 8.
I suspect the standing, not the faces, is the cause. Which would be ironic. Of the treatments I’ve studied by self-experimentation and found helpful, standing 9 or 10 hours, which greatly improved my sleep, was the most difficult. I loved what it did to my sleep. I still remember how wonderful it felt to be so well-rested the next morning. Even so I stopped doing it. As an experimental treatment, it was hard to measure how long I stood. As a lifestyle change, it was really hard to arrange so much standing. Whereas standing on one foot to exhaustion six times might be the easiest effective treatment I’ve studied (if it’s effective). Easy to measure, nothing to buy, no logistical problems.
I may try to repeat the earlier observation a few more times — as a kind of gift to myself — but now the main thing I want to do is separate the effects of the two factors, i.e., test one without the other.