Bradley participates in a sleep study at a university clinic. The researchers measure his body’s physiological changes while he is sleeping. Which hormone do they find in large doses just before Bradley wakes up?

a. melatonin
b. growth hormone
c. cortisol
d. prolactin

Cortisol

Explanation:

Cortisol is a steroid hormone made in the cortex of the adrenal glands that helps in the regulation of most body processes including Metabolism.

It also helps the body respond to danger and stress by increasing the bodies metabolism of glucose.

Cortisol is usually highest before we wake up this is because of the cortisol awakening response.

Here,the levels increase immensely before waking up so as to prepare the body to face anticipated stress since it is a stress hormone.

However the levels gradually decrease during the day.