Fewer people experience the dysomnia known as hypersomnia, when excessive sleepiness occurs; whether prolonged night sleep or increased daytime sleep episodes, neither provide a sense of restfulness on awakening.
A rare but fascinating dysomnia is narcolepsy, in which a person has repeated irresistible attacks of sleep, as well as brief episodes of loss of muscle tone and intensely vivid dreaming immediately upon falling asleep or awakening.
Another prevalent dysomnia is that of the "sleep-wake schedule disorder", now known as the circadian rhythm sleep disorder.
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