The notion that sleep or wakefulness is regulated by a substance that circulates within the blood is
A) proven by the observation that naps reduce sleep time the following night.
B) unlikely, given that the cerebral hemispheres of a dolphin sleep at different times.
C) REM and slow-wave sleep appear to involve independent mechanisms.
D) proven by studies of the dolphin sleep cycle.
E)proven by studies in which blood transfusion from a tired person to a rested person results in sleep in the recipient.
Answer: B
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