10/06/2026
Parasomnias: When Sleep Is Not So Quiet
Most people think of sleep as a still, quiet state. For many, it is. For others, sleep comes with unusual behaviours, movements, emotions, or experiences. These are called parasomnias.
Parasomnias are sleep disorders that happen during sleep, while falling asleep, or while waking up. They are usually grouped into three main categories: Non-REM parasomnias, REM parasomnias, and other parasomnias.
Non-REM parasomnias tend to occur during deeper stages of sleep. These include sleep terrors, sleepwalking, and confusional arousals. A person may sit up, walk, appear distressed, or seem confused, but have little or no memory of the event the next morning.
REM parasomnias happen during dream sleep. These include nightmare disorder, REM sleep behaviour disorder, and recurrent isolated sleep paralysis. REM sleep behaviour disorder is especially important because people may physically act out dreams, which can lead to injury. In some adults, it can also be linked with neurological conditions, so it should not be brushed off as “just bad dreams”.
Other parasomnias include bedwetting, sleep-related groaning, and sleep-related hallucinations. Some are more common in children. Others can continue into adulthood or appear later in life.
The key question is simple: is it occasional and harmless, or is it frequent, distressing, dangerous, or affecting daytime function?
A sleep assessment is worth considering if episodes are causing injury, disturbing others, leading to poor sleep, or happening alongside snoring, choking, witnessed apnoeas, marked fatigue, or unusual movements. Sleep disorders rarely read the textbook. That is why proper assessment matters.
At Essential Respiratory & Sleep Australia, we assess sleep concerns in a clinical setting and help patients understand what is happening during the night.
Because sometimes the problem is not getting to sleep.
Sometimes the problem is what happens after you do.