Hypocretin is a chemical in the brain which wakes people up and regulates sleep.

Narcolepsy is an overpowering need to sleep caused by a problem with the brain's ability to regulate sleep.

Primary Hypersomnia is thought to arise from problems with the brain's systems that regulate sleep and wake.

Serotonin is a chemical messenger that helps regulate mood, appetite, and sleep.

The nervous system controls blood pressure, regulates sleep, maintains balance and coordinates movements.

The human body clock, which regulates sleep and other activities, can be reset simply and quickly by exposure to light, new research has found.

Hypocretin is a primary chemical important in regulating sleep as well as states of arousal.

The anterior hypothalamus plays a role in regulating sleep.

Long-term use may cause damage to the brain's ability to regulate sleep, pain, memory, and emotions.

It produces melatonin, a hormone crucial in regulating sleep.