my best guess - at 00:10 clip you actually are in REM sleep. This seems to have happened for short clips starting at 23:08, 00:10, and 00:30 (roughly every 20 min.) but did not stay for long. This could also be the case at 00:55 and likely at 01:22 ending in a full waking... next was likely thrashed in the 01:30 thru 2:10 period. ...02:22 you are there again, and probably at 02:48. A more definite and longer period started about 4:25 ending in that free for all.
I am still completely baffled by the 04:35 to 5:40 period.
one suggestion I have is purposely break your night in two, about 4 hours in, and stay awake for about 1 hour or maybe a little more. then do a comparison. you may have to do that multiple days to get a baseline to compare.
Dedicated to QALity sleep.
You'll note I am listed as an Advisory Member. I am honored to be listed as such. See the fine print - Advisory Members as a group provide advice and suggestions to Apnea Board administrators and staff concerning Apnea Board operation and administrative policies. Membership in the Advisory Member group should not be understood as in any way implying medical expertise or qualification for advising Sleep Apnea patients concerning their treatment.