[island911]

FWIW, the 8hr sleep model is relatively new in the history of humans.

Literature of old makes reference to "second sleep." Essentially people routinely got up in the middle of the night for whatever reason. Tend to a fire or livestock, IDK. Then they would have their "second sleep."

So perhaps we are more genetically wired for a different rhythm.

I do know that stressing about not sleeping only exacerbates the problem. Knowing that even laying there awake brings many of the benefits of sleep, helps me so I don't stress too hard about not falling asleep.