Infant sleep is multiphasic, with many naps over 24 hours, before gradually becoming predominantly nocturnal from 4 to 6 months. JOHNÉR/PHOTONONSTOP With circles under their eyes and nerves on edge, ...
Leonardo da Vinci is said to have napped. So did Thomas Edison and Nikola Tesla. Now, “polyphasic sleep” — the practice of having several short naps rather than one long overnight sleep — is the ...
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