Very related to evolution, reproduction, survival, circadian, very lunar and
solar.
You're a protohuman, it's dark and cold at night, body is in reduction of
energy mode, the brain optimizes and increases the probability of survival -
where will you go tomorrow for highest probability of food,
... that during sleep, the brain fills in some inferencing and does memory
organization
http://www.nytimes.com/2007/10/23/health/23memo.html?_r=2adxnnl=1oref=sloginref=scienceadxnnlx=1193144966-KV6FdDqmqr8bctopdX24dw
(pointer from Kurzweil)
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