RT @aeonmag: Before we turned the lights on, humans had two sleeps. What are we missing out on? http://ow.ly/DXtD3 // Reproduction?
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@SanhoTree@aeonmag Learning this makes me feel better about my own wake/sleep schedule...6 hr increments
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Light as a hazard ? MT
@aeonmag: Before we turned the lights on, humans had two sleeps. What are we missing out on? http://ow.ly/DXtD3Thanks. Twitter will use this to make your timeline better. UndoUndo
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