Moneisha,a teenager,finds that she does not get tired until much later at night than she did when she was younger.Which hormone is MOST directly related to Moneisha's change in sleeping patterns?

A) Androgen
B) Testosterone
C) Estrogen
D) Melatonin

Melatonin is a hormone that regulates sleep patterns. The production of melatonin increases in the evening and decreases in the morning. As Moneisha gets older, her body may produce melatonin at a later time, causing her to not feel tired until later at night.