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Sleepwalking is a disorder that occurs when people walk or do other activity while they are still asleep.
Walking during sleep; Somnambulism
The normal sleep cycle has stages, from light drowsiness to deep sleep. During the stage called rapid eye movement (REM) sleep, the eyes move quickly and vivid dreaming is most common.
Each night people go through several cycles of non-REM and REM sleep. Sleepwalking (somnambulism) most often occurs during deep, non-REM sleep (stage 3 or stage 4 sleep) early in the night. If it occurs during REM sleep, it is part of REM behavior disorder and tends to happen near morning.
The cause of sleepwalking in children is usually unknown. Fatigue, lack of sleep, and anxiety are all associated with sleepwalking. In adults, sleepwalking may occur due to:
In the elderly, sleepwalking may be a symptom of an organic brain syndrome or REM behavior disorders.
Sleepwalking can occur at any age, but it happens most often in children ages 5 through 12. It appears to run in families.
When people sleepwalk, they may sit up and look as though they are awake when they are actually asleep. They may get up and walk around. Or they do complex activities such as moving furniture, going to the bathroom, and dressing or undressing. Some people even drive a car while they are asleep.
The episode can be very brief (a few seconds or minutes) or it can last for 30 minutes or longer. Most episodes last for less than 10 minutes. If they are not disturbed, sleepwalkers will go back to sleep. But they may fall asleep in a different or even unusual place.
Symptoms of sleepwalking include:
Usually, examinations and testing are not needed. If the sleepwalking occurs often, the doctor may do an exam or tests to rule out other disorders (such as partial complex seizures).
If the person has a history of emotional problems, they also may need to have a psychological evaluation to look for causes such as excessive anxiety or stress.
Most persons do not need specific treatment for sleepwalking.
In some cases, short-acting tranquilizers have been helpful in reducing sleepwalking episodes.
Some people mistakenly believe that a sleepwalker should not be awakened. It is not dangerous to awaken a sleepwalker, although it is common for the person to be confused or disoriented for a short time when they wake up.
Another misconception is that a person cannot be injured while sleepwalking. Sleepwalkers are commonly injured when they trip and lose their balance.
Safety measures may be needed to prevent injury. This may include moving objects such as electrical cords or furniture to reduce the chance of tripping and falling. Stairways may need to be blocked with a gate.
Sleepwalking usually decreases as children get older. It usually does not indicate a serious disorder, although it can be a symptom of other disorders.
It is unusual for sleepwalkers to perform activities that are dangerous. But precautions should be taken to prevent injuries such as falling down stairs or climbing out of a window.
You probably do not need to visit your health care provider. But discuss your condition with your doctor if:
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Mahowald MW. Disorders of sleep. In: Goldman L, Schafer AI, eds. Goldman’s Cecil Medicine. 24th ed. Philadelphia, Pa.: Elsevier Saunders; 2011:chap 412.