Alf, Sleep disorders are quite common in Parkinson's disease, with one form or another affecting at least 25% of PWP. Narcolepsy is one of the the sleep disorders found in PWPS. It is thought to be secondary to the PD, rather than a side effect to the PD medications. There are 4 classic symptoms associated with narcolepsy - vivid dreams, inability to stay awake, night terrors and cataplexy ( I am sure I mispelled that one). One does not have to exhibit all 4 symptons in order to be diagnosed with narcolepsy. In fact only 25% of narcoleptics exhibit all 4 symptoms. I know quite a few narcoleptic PWPS -some only mildly affected and a couple severely impaired by the disorder. There are some extremely good sleep disorder specialists that understand the role sleep disorders play in PD. My favorite is Dr. David Rye at Emory University in Atlanta, Ga. I have worked with him, have referred others to him and have also been a patient of his, myself. He has done extensive studies in this area. Terrie Whitling-Starr 45/18years with PD