An estimated 1 in 10 people in northern regions and 1 in 100 in Florida experience seasonal affective disorder, or depression that occurs during the winter
In 3 separate experiments, daily exposure to bright light between 30 and 120 minutes relieved symptoms in 60% of participants
Morning light therapy was much more effective that that given in the evening
Conclusion:
Light therapy, especially in the morning, alleviates symptoms of winter depression more than placebo
HEALTHandFITNESS.com 
