There are many types of parasomnia: sleepwalking, talking in one's sleep, sleep terrors, sleep paralysis, sleep-related hallucinations, bedwetting, sleep related eating disorder, REM behavior disorder, and sexsomnia. Each condition affects people differently and can cause a variety of problems.
For example, sleepwalkers may wander around their homes or even leave the house without realizing it. They may also engage in risky activities like climbing on roofs or driving a car.
Night terrors are often mistaken for nightmares, but they're actually quite different. People who experience them often scream and jump out of bed in terror. They may also have heart palpitations or feel like they're choking.
Bedwetting is a common problem among kids, but it can also happen in adults. REM behavior disorder causes people to act out their dreams, which can lead to injuries or even death.