Is parasomnia a disease?

Can be: Parasomnias are the result of sleep that has similarities to waking behaviors. An example would be sleepwalking or sleeptalking. In these examples the patient engages in behaviors that look like they are awake but their brian is sleeping. When parasomnias disrupt quality of sleep, cause problems like falling out of bed, wandering out of the home, or violent behaviors, it is time to see a doctor.

Yes, but parasomniaS: there are many parasomnias, not just one. Several are commonly known by society at large, RLS, circadian rhythm disorder (phase difficulties, either advanced or delayed, melatonin particularly helpful), REM sleep behavior disorder (sleep walking, sleep talking, Sleep specialists work in sleep centers that are able to perform (usually) overnight sleep studies