Found a link about hunter-gatherer sleep patterns:

http://www.sciencenews.org/sn_arc99/9_25_99/bob2.htm

One thing they mention, almost on the side, is that HGs didn't use pillows
or headrests.  This goes along with my recent hypothesis: that maybe
sleeping on a pillow causes neck and back problems.

It's strange, I have been sleeping without a pillow for a little while, and
now I find sleeping with a pillow uncomfortable.

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