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Excessive daytime somnolence
A state of abnormally strong desire for sleep during the daytime. [from HPO]
Narcolepsy
An abnormal phenomenon characterized by a classic tetrad of excessive daytime sleepiness with irresistible sleep attacks, cataplexy (sudden bilateral loss of muscle tone), hypnagogic hallucinations, and sleep paralysis. [from HPO]
Drowsiness
Abnormal feeling of sleepiness or difficulty staying awake. [from HPO]
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