________________ is a sleep disorder in which the person falls asleep suddenlythroughout the day.a.Narcolepsyb.Insomniac.Parainsomnia

The correct answer to the question is a. Narcolepsy.

Narcolepsy is a neurological disorder that affects the control of sleep and wakefulness. This condition causes excessive daytime sleepiness and sudden sleep attacks that can occur at any time during the day, irrespective of the circumstances. Individuals with narcolepsy may experience hallucinations, sleep paralysis, and cataplexy, which is a sudden loss of muscle tone triggered by strong emotions.

On the other hand, insomnia refers to difficulty in falling or staying asleep, while parasomnia encompasses undesirable physical events or experiences that disrupt sleep, such as sleepwalking or night terrors. Thus, narcolepsy specifically describes the sudden onset of sleep during undesired times, making it the accurate choice in this context.