From the Experts:
“More than 80 percent of people with low energy, fatigue or the Winter Blues may expect to benefit from light therapy. Although it varies from person to person, most feel the effects of light therapy within two to four days.”
Dr. Norman Rosenthal
Dr. Rosenthal is the psychiatrist who first described seasonal affective disorder (SAD) in the 1980s when he was a Senior Researcher for the National Institute of Mental Health. He pioneered research in the effects of light therapy, and his book, “Winter Blues”, details how people can overcome the mood and energy issues that come with seasonal changes.