> where anything less and I am significantly tired From what I have read, the ideal amount of sleep needed is quite personal and some people are fine with 6 to

> where anything less and I am significantly tired From what I have read, the ideal amount of sleep needed is quite personal and some people are fine with 6 to 7 hours while others just need 9 - but pretty much all studies consistently showed that less than 6 is definitely not enough and when sleeping less than 6 hours for a longer time you might even have hallucinations and at the very least your overall performance will suffer. So I think you are doing it right. You might want to experiment with those 90 minute sleep phase calculations like sleepyti.me or others. > A big factor also seems to be breathing function throughout sleep Absolutely! Sleep apnea is VERY serious and one of those things that prevent you from getting a good night of sleep for a lot of (very) large people.