Exams and Tests
Usually, no exams and tests are necessary. However, a medical evaluation may be completed to rule out medical causes of sleepwalking.
Additionally, one may get a psychologic evaluation done to determine whether excessive stress or anxiety is the cause of sleepwalking.
Sleep study tests may be done in persons in whom the diagnosis is still unclear.
Sleepwalking, night terrors, and confusional arousals are all common non-REM sleep disorders that tend to overlap in some of their symptoms. Approximately 15%-20% of young children through mid adolescence will experience some or all of these behaviors.
- Sleepwalking: see above
- Night terrors: Like sleepwalking,
night terrors tend to occur during the first half of a night's sleep, often within 30-90 minutes from falling asleep. Also, like sleepwalking,
night terrors occur during stage 3 and 4 sleep. However, unlike sleepwalking, an individual with night terrors will portray a sudden and often agitated arousal that may appear to parents as violent and terrified behaviors. Night terrors often start during the toddler years with a peak incidence between 5–7 years of age. During these times, evidence of a surge in autonomic nervous system activity is evident. Accelerated heart and respiratory rates, dilated pupils, and sweating are characteristic. Triggers for night terrors may include sleep deprivation, stress, or medications (stimulants, sedatives, antihistamines, etc.). Unlike sleepwalking, episodes of night terrors may recur for several weeks in a row, abate completely, and later return.
- Confusional arousals: Similar to night terrors, confusional arousals are characterized by a sudden and violent arousal from sleep with behaviors described as agitated and semi-purposeful in pattern. Speech is generally coherent (unlike in sleepwalking). A distinguishing point between night terrors and confusional arousals is the lack of autonomic nervous system phenomena in the latter. Confusional arousals tend to occur during the first half of a night's sleep (during stages 3 and 4). They are characteristically short-lived, lasting only 5 - 30 minutes in duration. Affected individuals typically have no memory of the event.
- Nocturnal seizures: Several important differential points help delineate the above three sleep behaviors from seizure activity that occurs at night.
Seizures by their nature are very brief, lasting often only a few minutes. In addition, seizure events likely to be confused with the above are characterized by a series of repeated, stereotypical, and frequent behaviors occurring in clusters. Importantly, seizures more commonly occur in the second half of the night's sleep. Patients often with have post-ictal (post-seizure) issues including
headache, extreme grogginess, being hard to arouse, as well as incontinence of urine and stool. To assist in establishing a correct diagnosis a neurologist may perform a video-EEG study to help clarify the issue.
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