<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, Ive been experiencing excessive daytime sleepiness and sudden loss of muscle tone while Im awake. I also sometimes have hallucinations when Im about to fall asleep.  <response>: It sounds like you may be experiencing symptoms of narcolepsy. To confirm the diagnosis, well need to conduct several medical tests, including an evaluation and interview, a depression screen, magnetic resonance imaging MRI, and an electroencephalogram EEG. Additionally, we may perform some therapeutic procedures on your eyelids, conjunctiva, or cornea to manage your symptoms. 