Question

____ is the most common sleep disorder.
sleep apnea
sleepwalking
narcolepsy
insomnia

Explanation:

Insomnia is a very prevalent sleep - related issue where individuals have trouble falling asleep, staying asleep, or have non - restorative sleep. It is more common than sleep apnea (pauses in breathing during sleep), sleepwalking (walking during sleep), and narcolepsy (uncontrollable episodes of falling asleep).

Answer:

D. Insomnia