Parasomnias

Parasomnias are a group of sleep disorders that involve unwanted events or experiences that occur while you are falling asleep, sleeping or waking up. Parasomnias may include abnormal movements, behaviours, emotions, perceptions or dreams. Although the behaviours may be complex and appear purposeful to others, you remain asleep during the event and often have no memory that it occurred. If you have a parasomnia, you may find it hard to sleep through the night.

Types of Parasomnias:

This parasomnia causes you to act in a very strange and confused way as you wake up or just after waking. It may appear that you don’t know where you are or what you are doing.

Sleepwalking involves getting up from the bed and walking around when you are still asleep in another room or outside your home and not remember how you got there.

Sleep terrors (or night terrors) cause you to wake up in intense fear with barely any memory, if any, of a terrifying dream. These episodes may cause you to wake up with the look of intense fear, kicking, thrashing and your heart racing

These episodes occur when you rapidly binge eat while you are only partially awake. You may only have a slight memory or no memory of the binge, and the food may be highly caloric or in strange combinations.

This potentially dangerous sleep disorder causes you to act out vivid dreams as you sleep. You may kick, punch or flail in response to your dream and episodes get worse over time

Sleep paralysis causes you to be unable to move your body when you are falling asleep or when you are waking up. These episodes typically last seconds or minutes

Frequent nightmares that prevent you from getting a good night’s sleep are considered a sleep disorder. People with nightmare disorder may fear going to sleep or have difficulty falling back asleep because of intense nightmares

Sleep related hallucinations are imagined events that seem very real. They are usually visual but may also involve your senses of sound, touch, taste and small. You may not be sure if you are awake or asleep.

This parasomnia causes you to hear a loud imaginary noise just before you fall asleep or awaken. It can sound like a bomb exploding, cymbals crashing or a painless loud bang. Episodes can be distressing and people often mistakenly think they are having a stroke or brain problem. Try to get more sleep each night to alleviate the symptoms.

Sleep talking is common and tends to be harmless. The subject matter is often loud and fairly nonsensical. Sleep talking can occur by itself or it may also be a feature of another sleep disorder

What causes parasomnias?
Parasomnias occur for a range of reasons, and treatment involves determining whether the events arise from non-REM or REM sleep and whether events occur spontaneously or are triggered by other sleep disruptions such as due to sleep apnoea or leg movements during sleep.  For this reason, a sleep study is an important part of evaluating parasomnias, and even if there is no abnormal behaviour on the night of the sleep study, there are subtle features on a sleep study that can give insights into the cause of parasomnias.

What treatments are available for parasomnias?
Parasomnias that arise out of non-REM sleep usually arise in childhood and continue in adulthood, but reduce in frequency with age.  Often these parasomnias can be sufficiently reduced by avoiding alcohol and sleep deprivation, but if needed, they usually respond to medication.  REM related parasomnias – such as the Rem-Sleep Behaviour Disorder (RBD) more commonly come on in middle-age, and if frequent or disturbing to bed partners require treatment with medication.  Sleep apnoea or leg movements during sleep can worsen both non-REM and REM parasomnias, so if these conditions are present treating them can help to reduce the frequency of parasomnias.

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