Sleep disorders may be caused by which of the following problems?
A. Abnormality in sleep-wake mechanisms in the brain, medical conditions, and use of chemical substances
B. Mental disturbances, abnormality in sleep-wake mechanisms in the brain, and increased theta brain wave activity
C. Increased theta brain wave activity, medical conditions, and physical disturbances
D. Abnormality in sleep-wake mechanisms in the brain, physical disturbances, and use of chemical substances
Answer: A
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