Card 46 / 54: Which of the following is not a commonly held hypothesis explaining our need to sleep?
A) We sleep in order to restore our body after a hard day.
B) We sleep in order to consolidate material that we've learned
C) We sleep because our ancestors were at risk for being eaten at night, and sleeping kept us from encounters with predators at night
D) We sleep in order to secrete melatonin

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