Mononucleosis or Narcolepsy?

One of S's more annoying habits is that he never leaves the house. I mean never. He's a 28 or 29 year old college junior, at least he will be in a few weeks, and he has spent the entire summer lounging in the house, and more frequently, sleeping. I don't mean normal sleeping, I mean nearly constant, end stage cancer sleeping. No job, no hobby, nothing to do all day but sit in my house and snore away.

Last night, Meg and I got home around 5:45. Where was S? In his room sleeping of course. We left and worked on the hovel for a few hours, ate cheese steaks, and came back around 9. S's light was still off. Was he home, or had he left? We weren't sure until he came out of his room 40 minutes later, went in to the bathroom, splashed around a little (no, the smell didn't go away), and then went back into his room and went back to sleep. So let's review. He was sleeping when we left the house in the morning. Sleeping when we came home, sleeping when we came home again, and sleeping when we went to bed. Rinse, Lather, Repeat, every day. Megan got up to pee at 3 AM, and he had chosen that great hour to finally rise from the dead and watch TV. I wonder if he secretly rules the world from 1 AM to 4 AM.

So rather than the age old question of "Is it live, or is it Memorex?" I must ask the new age question. Is it mono, or is it narcolepsy?