Answer:
c. While narcolepsy is a REM stage disorder, insomnia causes people to have difficulty falling asleep when they want to
Explanation:
They are different disorders, The narcolepsy is a mental disorder, in which the brain needs to regulate the REM cycles, that is the reason why people with this disease turns long hours with daytime sleepiness. and during night they can not sleep.
Insomnia, in the other hand, is a sickness that it can be solved with some strategies like not taking coffee at night, set some schedules to sleep at the same time, etc.
