Alfred J. Lewy MD PhD


Seasonal Affective Disorder (SAD)

Covers causes and symptoms of seasonal affective disorder (SAD), also known as winter depression. Includes info on bright light therapy and dawn simulation treatment. Discusses the use of melatonin, antidepressants, and counseling.

Melatonin

Melatonin is a hormone produced by the pineal gland. It helps regulate the natural sleep-wake cycle. Light affects how much melatonin your body produces. During the shorter days of winter, your body may make melatonin either earlier or later in the day than usual. This can lead to symptoms of seasonal affective disorder…

Pineal gland

The pineal gland is a small gland in the brain, located just above the brain stem. It makes melatonin. Melatonin is a hormone that helps regulate the sleep-wake cycle.

Circadian Rhythms

Circadian rhythms are the 24-hour cycles of physical and mental changes that are driven by your body’s “biological clock.” They are influenced both by things inside your body and by things in your environment, especially light. Your circadian rhythms affect your sleep-wake cycle, your body temperature, and other…

Seasonal Affective Disorder (SAD)

Covers causes and symptoms of seasonal affective disorder (SAD), also known as winter depression. Includes info on bright light therapy and dawn simulation treatment. Discusses the use of melatonin, antidepressants, and counseling.