Final answer:
When the pineal gland releases high levels of melatonin, it indicates drowsiness or sleepiness.
Explanation:
The pineal gland is responsible for producing and secreting melatonin, which helps regulate the sleep-wake cycle. When the pineal gland releases a high level of melatonin, as in Megan's case, it indicates a time when the body is drowsy or sleepy. This surge in melatonin production during the dark photoperiod prepares the body for sleep.
Learn more about Melatonin and Pineal Gland here:
https://brainly.com/question/41732633
