Sleep disorder

Pronunciation

Definition 1

A disturbance of normal sleep patterns. There are a number of sleep disorders that range from trouble falling asleep, to nightmares, sleepwalking, and sleep apnea (problems with breathing that cause loud snoring). Poor sleep may also be caused by diseases such as heart disease, lung disease, or nerve disorders. (NCI Dictionary)

Definition 2

A change from the patient's baseline sleeping pattern, either an increase or a decrease in the number of hours slept. This can also refer to alterations in the stages of sleep. (NCI Thesaurus)

Definition 3

Conditions characterized by disturbances of usual sleep patterns or behaviors. Sleep disorders may be divided into three major categories: DYSSOMNIAS (i.e. disorders characterized by insomnia or hypersomnia), PARASOMNIAS (abnormal sleep behaviors), and sleep disorders secondary to medical or psychiatric disorders. (From Thorpy, Sleep Disorders Medicine, 1994, p187) (NLM, Medical Subject Headings)

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