Answer:
hypocretin
Explanation:
Narcolepsy is a sleep disorder characterized by excessive daytime sleepiness, even when the person slept well at night. Sleep attacks can occur at any time and in unusual situations: standing in a bus, during a doctor's appointment, driving a car, or operating machinery, for example.
Genetic factors are involved in narcolepsy, which is caused by altered hypocretin neurotransmitter balance. Studies show that individuals with narcolepsy lack cells in the hypothalamus that secrete a hypocretin neurotransmitter that promotes wakefulness.
