Which of these statements about sleep-wake cycles are true, except:
a. sleep is associated with the secretion and regulation of a number of hormones.
b. brain areas involved in sleep-wake cycles include the thalamus, hypothalamus, and pons.
c. they are controlled by multiple brain areas acting together.

Option A

Explanation:

The sleep and wake cycle involves only one hormone named melatonin, whose detectable level is  found in the blood during night time.

The area that is responsible for controlling the sleep wake cycle includes multiple parts of the brain which work in coordination with each other.

These areas include thalamus, pons and hypothalamus which regulates the sleep wake cycle.

Hence, the correct answer is option A