MadSci Network: Neuroscience

Subject: Why do we feel sleepy at 4PM ?

Date: Mon Sep 18 06:06:35 2000
Posted by Cassian Young
Grade level: grad (non-science) School: No school entered.
City: London State/Province: No state entered. Country: UK
Area of science: Neuroscience
ID: 969271595.Ns

I'm told everyone is most sleepy at around 4AM and 4PM because of natural 
circadian rhythms. Why ?

What evolutionary benefit does the 4PM low confer? Shouldnt we be working 
the fields or hunting deer at this time in the afternoon?

Re: Why do we feel sleepy at 4PM ?

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