Asked • 07/19/19

What causes humans to be sleepy?

Is there a hormone or group of hormones that regulates when we feel sleepy late at night, or in the morning? Or is sleepiness caused by some other non-hormonal mechanism? (e.g. pure psychological, or neuronal.)

1 Expert Answer


Izzy H. answered • 07/19/19

New to Wyzant

Hi Wize Ants, my names is Izzy

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