How long after first episode of narcolepsy appear cataplexy?

Depends: Approximately 30% of narcoleptics do not experience cataplexy, making the diagnosis of narcolepsy a bit more difficult. Have you seen a neurology sleep specialist and undergone a sleep study? If not, see your physician in order to discuss your symptoms. http://www.ninds.nih.gov/disorders/narcolepsy/detail_narcolepsy.htm , http://www.nhlbi.nih.gov/health/health-topics/topics/slpst/