Find the centroid of the region bounded by the graphs of the given equations. 
Definitions:
Serotonin
A neurotransmitter involved in various functions, including mood regulation, digestion, and sleep.
Parkinson's Disease
A degenerative disorder of the central nervous system that affects movement, often including tremors and stiffness.
Schizophrenia
A serious mental disorder characterized by abnormal social behavior, difficulty distinguishing between reality and imagination, and impaired emotional expression.
Sleep
A natural, restorative state in which the body and mind enter a reduced or suspended level of sensory and motor activity.
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