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

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Insomnia is defined as difficulty falling asleep or staying asleep, resulting in impaired daytime functioning. Sleep apnea involves pauses in breathing during sleep, which can lead to poor sleep quality but may not necessarily cause difficulty falling asleep. Narcolepsy involves excessive daytime sleepiness and sudden episodes of falling asleep, but not necessarily difficulty falling asleep at night. Parasomnias involve abnormal behaviors during sleep, such as sleepwalking or night terrors, and may not necessarily affect the ability to fall asleep or stay asleep.

Which of the Following Results in Impairment of Daytime Functioning