Melatonin

Definition

Melatonin is a hormone produced by the pineal gland in the brain that regulates sleep-wake cycles. Its production increases in response to darkness, helping to promote sleep and adjust the body's internal clock.

Related terms

Pineal Gland: A small endocrine gland in the brain that produces melatonin, regulating sleep patterns.

Circadian Rhythm: The body's internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours.

Endocrine System: The collection of glands that produce hormones which regulate metabolism, growth and development, tissue function, sexual function, reproduction, sleep, and mood