And hypnopompic hallucinations

If your answer to any of these questions is yes, you already understand our natural tendency to dissociate—to be in one conscious state but to experience in it properties of another. I will show that when amplified this normal process can lead to such exceptional states as sleep walking and hypnopompic hallucinations, and that these exceptional states can become models for understanding out of body experiences, extrasensory perceptions, or alien abductions All of these exotic experiences can— and usually do—occur in the privacy and safety of our bedrooms. 

Ohayon MM, Priest RG, Caucet M (1996) Hypnagogic and hypnopompic hallucinations. A pathological phenomenon Br J Psychiatry 169 459-467... 

Monitoring parameters for pharmacotherapy of narcolepsy include reduction in daytime sleepiness, cataplexy, hypnagogic and hypnopompic hallucinations, and sleep paralysis. Patients should be evaluated regularly during medication titration, then every 6 to 12 months to assess adverse drug events (e.g., mood changes, sleep disturbances, and cardiovascular abnormalities). If symptoms increase during therapy, PSG should be done. 

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