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Out of the way FROMSoft, Pokémon Sleep is now the hardest game ever created
(cdn.imgchest.com)
Note the follow up that sticking to your bedtime 4 times in a row is another goal. We're ruined, folks.
For a long time, I didn't feel fully rested with fewer than 11 hours of sleep... meaning, except for some weekends, I felt like a zombie all the time... but could fall asleep and take a nap any moment anywhere, for a few hours of wake up time worth (great for exams, conferences and the like: nap half an hour before, go totally fresh, fall on the nose afterwards). Then, last year, got some serious case of insomnia where I could neither fall asleep nor fully wake up for like a week straight... that was much worse, felt like going crazy, had to start taking meds to sleep 2, then 4, then maybe 5 hours, and still wake up feeling like a train had passed me over. Then like a month ago, suddenly fell asleep at around 7pm, didn't take my sleeping meds, and woke up totally refreshed at 2am... the F!
So, based on personal anecdotal evidence... I'd say sleep is a mystery, and I want my cyborg on/off switch now, please... 🤖
You might want to look at getting some tests done. I'd look at Sleep Apnea and Thyroid tests. Those can be major issues that don't get looked at often.