Realistically, Narcolepsy is related to Epilepsy. Practically, it might be closer to being a Chronic Affliction or Blackouts depending on its severity and duration.
Shadowjack's HR version of Chronic Affliction looks to be similar to a version I posted here:
http://forums.sjgames.com/showthread...nic+affliction
There are good points about both versions, so I will be updating my version to incorporate Shadowjack's ideas.
I recently posted a HR "Blackouts" disadvantage here:
http://forums.sjgames.com/showthread...ight=blackouts
My HR version of Narcolepsy is based on Epilepsy but has a "Frequency of Appearance" roll based on HT, and a base cost of -20 points*.
Narcolepsy (-20 points*): You are in subject to seizures which cause you to suddenly fall asleep. If you fail your self-control roll you fall into a deep sleep which lasts 1d minutes. During this time you sleep normally, and might even dream, but you can’t wake up until the seizure is over. On a critical failure you hurt yourself as you fall and take normal falling damage for 2 yards.