Winter Depression Linked With Melatonin Levels
People with seasonal affective disorder (SAD) instinctively shift their melatonin levels with the seasons, paralleling the hibernation patterns of mammals. This however did not appear true for those who don't react to shorter days and longer nights with deepening depression.
Healthy individuals were found to be immune to shifts in the natural daylight, with their melatonin levels remaining stable throughout the seasons. However, those with winter depression had a moderate decrease in the length of time they produced melatonin during the summertime.
The Archives of General Psychiatry (December 2001;58:1108-1114) added that patients who had SAD, the duration of melatonin secretion became longer in winter and shorter in summer, just as it occurs in other mammals. That could be controlling this panoply of changes that occurs in people when they get depressed in the winter.
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