In seasonal affective disorder (SAD) is associated with winter depression Typically, these individuals not only feel depressed they also feel tried, slow down, and generally oversleep, overeat, and crave carbohydrates in the winter. In the summer, these same patients feel very good and maybe even are elated, active, and energetic.
The key hormonal change caused by exposure to full spectrum lighting may be a reduced secretion of melatonin from the pineal gland and an increased secretion of cortisol by the adrenal glands. Melatonin supplementation is thought to improve SAD because it increases brain melatonin levels, but it may also suppress cortisol secretion.Take 3-5 mg 45 minutes before retiring.
Vitamin D is also an important consideration. Many experts recommend a dosage of 2,000 to 5,000 IU of vitamin D3 daily, especially during the winter months.