Final answer:
Narcolepsy option a is correct is the likely condition if someone suddenly falls to the ground from laughter due to excessive daytime sleepiness, as it involves an irresistible urge to sleep with instances of cataplexy.
Step-by-step explanation:
If your friend experiences excessive daytime sleepiness and suddenly falls to the ground while laughing, your friend is probably suffering from narcolepsy.
Narcolepsy is a sleep disorder characterized by an irresistible urge to sleep during waking hours, often accompanied by cataplexy which is a lack of muscle tone or weakness that can lead to collapse. This condition is also associated with hallucinations similar to those experienced during REM sleep.
The sudden loss of muscle control, especially during laughter or excitement, is a classic sign of narcolepsy-associated cataplexy. Treatments for narcolepsy often involve stimulant medications and sometimes antidepressants to manage symptoms.
Narcoleptic episodes can be triggered by heightened arousal or stress. Treatment options for narcolepsy include the use of stimulant drugs and antidepressants.