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Since narcolepsy is a chronic sleep disorder that causes overwhelming daytime drowsiness, it usually results in overwhelming drowsiness. So, a cause could be not getting enough sleep.
Answer:
A depressant, or central depressant, is a drug that lowers neurotransmission levels, which is to depress or reduce arousal or stimulation, in various areas of the brain. Depressants are also occasionally referred to as "downers" as they lower the level of arousal when taken.
Explanation: