Serotonin is another neurotransmitter that has many functions throughout the body. In the brain, it helps regulate mood, appetite, sleep cycle, memory and learning.
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Selective Serotonin Reuptake Inhibitors (SSRIs): A class of drugs typically used as antidepressants in the treatment of major depressive disorder and anxiety disorders.
Mood Disorders: Psychological disorders characterized by emotional extremes such as depression or bipolar disorder.
Melatonin: A hormone produced by pineal gland affecting sleep-wake cycles.