Off My Chest
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He is definitely entering REM sleep in that amount of time, even more so because it's routine. Your body can enter rem almost instantly when adapted to polyphasic sleep schedules for instance.
We enter rem sleep multiple times in a nights sleep, it's a cycle and it can kind of be messed with.
Benefits of napping but mostly only if it's long enough to enter rem. https://onlinelibrary.wiley.com/doi/10.1111/jsr.14177
Extreme polyphasic sleep and how rem isn't reduced significantly. https://www.biorxiv.org/content/10.1101/2023.06.20.542775v1.full
Polyphasic sleep to that level (3 hours of sleep a day through 20 minute naps) is a bit extreme and has other complications. Splitting your sleep schedule in two seems fine, although I don't know of any long term studies.
There's a reason there's not many long term studies. And based on the subjective experience of OP's rested self, he's not getting the correct balance of sleep.
Most people who preach polyphasic sleeping are grind set workaholics. There's very little research that supports it and a whole lot discouraging it in most cases.
https://pubmed.ncbi.nlm.nih.gov/33795195/
I touched on how a 3 hour per day uberman polyphasic sleep schedule isn't good for you. It does show how rem is more complicated then 7+ hours of straight sleep or nothing. But it's not what OP is doing. He is getting the full amount of sleep, just in two segments which doesn't impact much since sleep is cyclical (much closer to the first nap study).
In either case, it's clear OP is entering rem sleep imo.
I guess OP can chime in and tell us if he feels unusually tired. Depending on how long his routine has been going, it would answer the question.
Honestly depends on the day. Some days I feel rested enough. Others, like yesterday, not so much. I will say more often than not, I do feel tired.