Yes, I have read that before the industrial revolution people would sleep when it got dark for about 4 hours then get up for an hour or so, maybe have some food and then have a 'second sleep'. Sleeping for 8 hours straight didn't appear to happen. Here's some info
https://en.wikipedia.org/wiki/Segmented_sleep
I wonder whether concussion resets the brain to it's earlier setting?
Quote:
Originally Posted by Laupala
... Before modern light pollution, apparently many people would wake for a couple hours in the middle of the night, experiencing a strange calm/alertness, which some have described as an altered state of consciousness.
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