Here is a listing of web pages providing more information about Depression

If needed......
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Symptoms of Depression
Although depression may occur only once during your life, people typically have multiple episodes. During these episodes, symptoms occur most of the day, nearly every day.
Click here for more information
Serotonin
Serotonin deficiency has several symptoms, including low mood and low quality sleep.
Serotonin regulates a wide range of bodily functions, including orgasm, sleep, bladder and bowel functions, and mood.
Click here to read about some of the potential symptoms associated with low serotonin levels.