Seasonal affective disorder (SAD) is a type of depression that occurs at specific times of the year, most commonly during the fall and winter months when daylight hours are shorter. This condition is characterized by symptoms such as low energy, irritability, changes in sleep patterns, and difficulty concentrating. The seasonal patterns of SAD link closely to the effects of decreased sunlight on mood-regulating neurotransmitters, which can also be influenced by sleep deprivation.
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