Some anecdotal evidence for segmented sleep: When I've been up during the night in December 2024

Over the years I've developed an interest in segmented sleep, as it is called. Instead of sleeping straight through the night for eight hours, or seven or nine, whatever, you have several sleep sessions interspersed with sessions where you do other stuff. This happens to me during a creative phase. I went into a down phase a couple of months ago and started coming out in the third week of November. I've had a LOT of segmented sleep since then. 

One of the things I'd do in one of my middle-of-the-night work sessions is make an entry ...