The inability to fall asleep without masturbating.
Evan: Dude, I just couldn't fall asleep last night.
Bryan: Did you try masturbating?
Evan: No......

(Next Day)

Evan: It worked! I slept like a rock!
Bryan: Yeah, you just have fap apnea.
by Nik-uh-ris M. August 2, 2011
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