Psychology Wiki


34,141pages on
this wiki
Revision as of 23:53, January 3, 2010 by Dr Joe Kiff (Talk | contribs)

ICD-10 F51.3-F51.4
ICD-9 307.47, 780.59
DiseasesDB {{{DiseasesDB}}}
MedlinePlus {{{MedlinePlus}}}
MeSH {{{MeshNumber}}}


NREM Parasomnias


Some NREM parasomnias are common during childhood but decrease in frequency with increasing age (sleep-walking, night-terrors, and confusional arousal). They can be triggered in certain individuals by alcohol, sleep deprivation, physical activity, emotional stress, depression, medications, or a fevered illness. These disorders of arousal can range from confusional arousals, somnambulism, to night terrors. Other specific disorders include sleepeating, sleep sex, teeth grinding, rhythmic movement disorder, restless legs syndrome, and somniloquy.

Confusional arousals

With a prevalence of 4%, confusional arousals are not observed very often in adults; however, they are common in children.[2] Confusional arousals are occasional thrashings or inconsolable crying among children—they are characterized by movements in bed.

Sleepwalking (somnambulism)

Sleepwalking has a prevalence of 1-17% in childhood, with the most frequent occurrences around the age of eleven-twelve. About 4% of adults experience somnambulism. [3]

Sleep terrors (night terrors)

Sleep terrors is the most disruptive arousal disorder since it may involve loud screams and panic; in extreme cases, it may result in bodily harm or property damage by running about or hitting walls. Unfortunately, all attempts to console the individual are futile and may prolong or intensify the victim’s confused state. Usually the victim experiences amnesia after the event but it may not be complete amnesia. Up to 3% of adults suffer from sleep terrors and exhibited behavior of this parasomnia can range from mild to extremely violent. [4]

Bruxism (teeth grinding)

Bruxism is a common sleep disorder where the sufferer grinds their teeth during sleep. This can cause sleep disruption for the sufferer and bed partner, wear and fracture of teeth, and jaw pain.

Restless Leg Syndrome

Restless leg syndrome sufferers report an itching, burning, or otherwise uncomfortable feeling in their legs, usually exacerbated when resting or asleep. This causes sleep disruption as they wake to move or scratch their legs.

Periodic Limb Movement Disorder

Periodic limb movement disorder is a sudden involuntary movement of limbs. It can cause sleep disruption and injury for both the sufferer and bed partner. Many people who have restless leg syndrome also have periodic limb movement disorder.

REM Parasomnias

REM Sleep Behavior Disorder

REM Sleep Behavior Disorder is the most common REM sleep parasomnia in which muscle atonia is absent. This allows the individual to act out their dreams and may result in repeated injury-- bruises, lacerations and fractures-- to themselves or others. Patients may take self-protection measures by tethering themselves to bed, using pillow barricades or sleeping in an empty room on a mattress. [5] Demographically, 90% of RBD patients are males, and most are older than 50 years of age. [6]

Typical clinical features of REM sleep behaviour disorder are: - male gender predeliction - mean age of onset 50–65 years (range 20–80 years) - vocalisation, screaming, swearing that may be associated with dreams - motor activity; simple or complex that may result in injury to patient or bed-partner - occurrence usually in later half of sleep period (REM sleep) - may be associated with neurodegenerative disease [7]

Acute RBD, occurs mostly as a result of a side-effect in prescribed medication- usually antidepressants.

Chronic RBD is idiopathic or associated with neurological disorders. There is a growing association of chronic RBD with neurodegenerative disorders – Parkinson’s disease, multiple system atrophy (MSA) or dementia-- as an early indicator of these conditions by as much as 10 years.

Patients with narcolepsy also are more likely to develop RBD.



See also




  1. Bassetti et al., Lancet (2000); 356: 484–485
  2. Mahowald & Schenck: 1283.
  3. Mahowald & Schenck. 1283.
  4. Mahowald & Schenck: 1283.
  5. Mahowald & Schenck:1284.
  6. Mahowald & Schenck :1284.
  7. Boeve et al.

Further reading


External links


Around Wikia's network

Random Wiki