narcolepsy \NAHR-kuh-lep-see\, noun:
a disorder characterized by uncontrollable bouts of sleepiness during the daytime, occasional loss of muscle power and paralysis, and hallucinations during sleep.
My usage:
After a weekend bout of partying, most young people claim narcolepsy as the number once reason they can’t function on Monday morning at work—but most employers are not fooled by such claims.
OR
My best friend has selective narcolepsy. Just when you want to ask her something important, she gets sleepy.
Hmm, that one was kinda lame.
Oh well. 
