Definition of parasomnia in English:
 parasomnia
noun parəˈsɒmnɪəˌperəˈsämnēə
mass nounMedicine A disorder characterized by abnormal or unusual behaviour of the nervous system during sleep.
 he's being treated for parasomnia at a sleep disorder clinic
 Example sentencesExamples
-  Nocturnal head banging, sleep talking and nocturnal leg cramps are other rare forms of parasomnia.
 -  Sleepwalking is a form of parasomnia, a class of sleep disorders characterized by partial wakefulness.
 -  Almost 20-40 percent of all normal kids have parasomnia at least once in their lifetimes.
 -  In some cases, parasomnia can cause people to commit crimes in their sleep.
 -  Keep reading to learn about the three categories of parasomnia (rhythmic, paroxysmal, and static disorders) and find out how you can help your child.
 
Origin
  
1930s: blend of para-1 and insomnia.