<human>:  Why do people who have a sleep disorder called Parasomnia act out their dreams?
<bot>: Parasomnias are movements or actions that occur during sleep. They are a type of a sleep disorder. People who have parasomnias may act out their dreams, which can cause problems for them and their families. Parasomnias include sleepwalking, night terrors, sleep talking, and sleep-related eating disorders.