Which of the following results in impairment of daytime functioning because of difficulty falling and staying asleep?

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Insomnia is characterized by difficulty falling asleep or staying asleep, and this can result in impairment of daytime functioning. Sleep apnea, narcolepsy, and parasomnia may also interfere with sleep and cause daytime sleepiness or impairment, but specifically do not refer to difficulty falling or staying asleep.

Which of the Following Results in Impairment of Daytime Functioning