Final answer:
Marvin, diagnosed with narcolepsy, is likely to face excessive daytime sleepiness, sudden muscle weakness or cataplexy, and potential hallucinations. He may undergo treatment with stimulant drugs, and future medications might target the hypocretin system in the brain.
Step-by-step explanation:
Marvin, who has been diagnosed with narcolepsy, is very likely to experience excessive sleepiness during normal waking hours. These sleep episodes can occur at inappropriate times, such as when eating, socializing, or even driving, posing significant risks to safety. Moreover, Marvin may also have symptoms of cataplexy, a sudden muscular weakness triggered by emotions, which can cause parts of his body to collapse. While treatment for narcolepsy commonly involves the use of stimulant drugs to manage sleepiness, in some cases, a combination of medication, such as a stimulant with an antidepressant, might be more effective. It is also possible that Marvin could experience vivid, dream-like hallucinations during these episodes.
It's important to understand that narcolepsy symptoms can vary greatly among individuals and that side effects like irritability, cognitive impairment, and even hallucinations can arise from the chronic sleep disruption associated with narcolepsy. Treatments are often personalized, and recent research suggests that future medications may target the decreased levels of hypocretin, which is thought to be a factor in the development of this sleep disorder.