Why does SAD develop?
So, how does one get SAD? The strongest theory concerns melatonin.
Melatonin is secreted at night, which keeps the individual asleep. During the
daytime hours, melatonin decreases substantially. Sunlight is believed to decrease
the secretion of melatonin. In the cloudy winter months, the individual is not
receiving enough sunlight, therefore bright light therapy is prescribed and has
been found to be an effective treatment.
Researchers in sleep clinics have found high concentrations of melatonin in
the blood of clients during the nighttime and early morning hours. During the
daylight hours, the control groups had decreases in melatonin in their blood;
however, the SAD group had high concentrations of melatonin. After the SAD group
used light therapy, their melatonin levels decreased.
Please address any questions concerning this article to:
Patricia A. Schafer, Professional
Counselor CCDC-III
Looking Forward Mental Health Center
Click here for contact information
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