Normally, most people sleep at night. What is the physiological rationale?
a. The master biological clock responds to darkness with sleep.
b. Darkness stimulates histamine release, which promotes sleep.
c. Cooler environmental temperatures stimulate retinal messages.
d. Stimulation of the sympathetic nervous system promotes sleep.
A
The master biological clock in the suprachiasmatic nucleus (SCN) of the hypothalamus regulates sleep as well as other physiological processes. Darkness cues the clock for sleep. Light cues it for wakefulness. Light stimulates retinal messages. Histamine release is associated with wakefulness. Stimulation of the sympathetic nervous system promotes alertness.
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