The best replacement for narcolepsy is sleep apnea.

The best alternatives to narcolepsy are rated as following:
★★★★★  sleep apnea
★★★★  epilepsy
★★  hypersomnia
★★  chronic fatigue
★  insomnia
★  idiopathic hypersomnia
★  cataplexy
★  chronic fatigue syndrome
★  sleep deprivation
★  excessive daytime sleepiness
★  sleep paralysis
  syncope
  apnea
  primary hypersomnia

Your alternative for narcolepsy is not listed? Suggest!
Speaking about narcolepsy, one probably shouldn't forget about cataplexy.

Other search terms related to narcolepsy and their ratings are:
★★★★★ cataplexy
★★★ sleep apnea
★ rem sleep
★ delayed sleep phase syndrome
★ sleep paralysis
associated cataplexy
out cataplexy
You have in mind a companion for narcolepsy and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of narcolepsy in all years. Click on graph for more.
narcolepsy
sleep apnea
epilepsy