Final answer:
Your friend probably has a disorder known as Narcolepsy. Narcolepsy is a sleep disorder characterized by an irresistible urge to fall asleep during waking hours. It is often associated with cataplexy, which is a lack of muscle tone or muscle weakness.
Step-by-step explanation:
Your friend probably has a disorder known as Narcolepsy. Narcolepsy is a sleep disorder characterized by an irresistible urge to fall asleep during waking hours. It is often associated with cataplexy, which is a lack of muscle tone or muscle weakness. In some cases, it involves complete paralysis of the voluntary muscles.