Why will taking a melatonin pill in the evening have little effect on sleepiness?
A) Body temperature is too low.
B) Body temperature is too high.
C) The pineal gland is only active in the morning.
D) The pineal gland produces melatonin at that time anyway.

Question

Quizplus · Accepted Answer

Melatonin is predominantly produced by the pineal gland in response to the decreasing levels of light during evening/nighttime. Therefore, taking a melatonin pill in the evening would not have much effect on sleepiness as the pineal gland is already producing melatonin naturally at that time.

Why Will Taking a Melatonin Pill in the Evening Have