Sleepy
Megan's pineal gland is releasing a high level of melatonin. Megan is most likely sleepy.
The pineal gland is a tiny, pine cone shaped, endocrine gland that produces melatonin. The pineal gland is situated near the center of the brain between the two hemispheres. Melatonin is a hormone that influences the regulation of wake and sleep patterns and seasonal functions. The production of melatonin by the body reduces with age. Melatonin is also produced as a supplement in oral tablets form.