Grandpa Is Napping in His Recliner and Snoring Loudly

Multiple Choice

Grandpa is napping in his recliner and snoring loudly. When he suddenly stops snoring, you look to see if he is okay. He appears to not be breathing. For a moment you wonder if he's dead, but suddenly he snorts and resumes snoring. Grandpa appears to suffer from

A) insomnia.
B) somnambulism.
C) narcolepsy.
D) sleep apnea.