Canadian Medical Guide > Diseases > Nervous System Diseases > Sleep Disorders > Dyssomnias > Sleep Disorders, Intrinsic Terms and Definitions




Sleep Disorders, Intrinsic

Medical Definition: Dyssomnias (i.e., insomnias or hypersomnias) associated with dysfunction of internal sleep mechanisms or secondary to a sleep-related medical disorder (e.g., sleep apnea, post-traumatic sleep disorders, etc.). (From Thorpy, Sleep Disorders Medicine, 1994, p187)
Also Called: Central Alveolar Hypoventilation Syndrome,Hypersomnia, Post-Traumatic,Sleep State Misperception
Sleep Disorders, Intrinsic Categories.
Canadian Medical Guide Definition Disorders of Excessive Somnolence - Disorders characterized by hypersomnolence during normal waking hours that may impair cognitive functioning. Subtypes include primary hypersomnia disorders (e.g., IDIOPATHIC HYPERSOMNOLENCE; NARCOLEPSY; and KLEINE-LEVIN SYNDROME) and secondary hypersomnia disorders where excessive somnolence can be attributed to a known cause (e.g., drug affect, MENTAL DISORDERS, and SLEEP APNEA SYNDROME). (From J Neurol Sci 1998 Jan 8;153(2):192-202; Thorpy, Principles and Practice of Sleep Medicine, 2nd ed, p320)
Canadian Medical Guide Definition Nocturnal Myoclonus Syndrome - Excessive periodic leg movements during sleep that cause micro-arousals and interfere with the maintenance of sleep. This condition induces a state of relative sleep deprivation which manifests as excessive daytime hypersomnolence. The movements are characterized by repetitive contractions of the tibialis anterior muscle, extension of the toe, and intermittent flexion of the hip, knee and ankle. (Adams et al., Principles of Neurology, 6th ed, p387)
Canadian Medical Guide Definition Restless Legs Syndrome - A disorder characterized by aching or burning sensations in the lower and rarely the upper extremities that occur prior to sleep or may awaken the patient from sleep. Complying with an irresistible urge to move the affected limbs brings temporary relief. Sleep may become disrupted, resulting in excessive daytime hypersomnolence. This condition may be associated with UREMIA; DIABETES; and rheumatoid arthritis. Restless Legs Syndrome differs from NOCTURNAL MYOCLONUS SYNDROME in that in the lattercondition the individual does not report adverse sensory stimuli and it is primarly a sleep-associated movement disorder. (Adams et al., Principles of Neurology, 6th ed, p387; Schweiz Rundsch Med Prax 1997 Apr 30;86(18):732-736)
Canadian Medical Guide Definition Sleep Initiation and Maintenance Disorders - Disorders characterized by impairment of the ability to initiate or maintain sleep. This may occur as a primary disorder or in association with another medical or psychiatric condition.

Sleep Disorders, Intrinsic Medical Definitions and Terms

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