I remember a while ago hearing one theory on sleep is that one common manifestation of a natural sleeping schedule is 4 hours (8 - 12), followed by being awake

I remember a while ago hearing one theory on sleep is that one common manifestation of a natural sleeping schedule is 4 hours (8 - 12), followed by being awake for 2 hours (12 - 2) and then another 4 hours (2 - 6) of sleep, for a total of 8 hours. I've also noticed in myself often I will get tired around 8:30 or so. But I usually stay awake and then don't end up falling asleep till 2. This is anecdotal but it seems to fit this pattern of needing to get one round of sleep in (which I blow past), being awake late, and then falling asleep from 2am - 8/9am. I suspect the 2 - 8/9 is that instead of 2-6 since I missed also the previous window.