If you’re at risk of SAD, you may already have less serotonin activity. These chemicals include serotonin, which contributes to feelings of happiness. Brain chemical imbalance: Brain chemicals called neurotransmitters send communications between nerves.When it shifts, you’re out of step with the daily schedule you’ve been used to and can’t adjust to changes in daylight length. This internal clock regulates your mood, sleep and hormones. Biological clock change: When there’s less sunlight, your biological clock shifts.Lack of sunlight may trigger the condition if you’re prone to getting it. Researchers don’t know exactly what causes seasonal depression. What causes seasonal affective disorder (SAD)? People who have summer SAD may experience: Sleeping problems (usually oversleeping).Loss of interest in usually pleasurable activities, including withdrawing from social activities.Feelings of hopelessness or worthlessness.Sadness, feeling depressed most of the day, almost every day.So if you have seasonal affective disorder, you have mood changes and symptoms of depression, including: According to the American Psychiatric Association, SAD is officially classified as major depressive disorder with seasonal patterns. Seasonal affective disorder (SAD) is a type of depression. What are the symptoms of seasonal affective disorder (SAD)? There’s less sunlight during the winter at these latitudes.
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