Although it's often referred to as the narcolepsy tetrad am going to make it a pentad for USMLE and mnemonic purposes.
Just remember CHASE
here's the key
- Cataplexy, sudden loss of tone while awake. Considered by many as a pathognomonic sign of narcolepsy.
- Hypnagogic hallucinations experience as the patient falls into sleep (don't confuse with hypnapompic which occurs while waking up and can be seen in normal people)
- Automatism (Automatic behavior) in which the sleeper continues to do wakefullness behavior such as talking or throwing objects.
- Sleep paralysis, as with Cataplexy this symptom is though to be due excessively activated REM sleep.
- Excessive Daytime Sleeping (EDS), remember that this is also seen in patients with sleep apnea