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Sleep related terms

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  • Abdominal Movement

  • In diagnostic sleep studies, abdominal movement is recorded. This is one of the measures of respiratory effort, reflecting movement of the diaphragm.

  • Advanced Sleep Phase Syndrome (ASPS)

  • Phases of the daily sleep/wake cycle are advanced with respect to clock time. This is classified as a circadian rhythm disorder. The sleep phase occurs well ahead of the conventional bedtime and the tendency is to wake up too early.

  • Alpha intrusion

  • Brief occurrence of alpha activity during a stage of sleep.

  • Alpha rhythm

  • EEG oscillations, prominent over the occipital cortex, with a frequency of 8-13 Hz in adults; indicative of the awake state; present in most, but not all, normal individuals; most consistent and predominant during relaxed wakefulness.

  • Ambulatory Monitor

  • Portable system used to record (continuously) multiple physiological variables during sleep.

  • Apnea

  • Literally means no breath; the cessation of airflow at the nostrils and mouth for at least 10 seconds.

  • Apnea index (AI)

  • A measure of the severity of sleep apnea; the number of apnea events per hour.

  • Apnea/Hypopnea index (AHI)

  • The number of apneas and hypopneas per hour. 5-20=mild, 21-50=moderate, above 51 severe

  • Arousal

  • Abrupt change from sleep to wakefulness, or from a "deeper" stage of non-REM sleep to a "lighter" stage

  • Arousal Disorder

  • Parasomnia disorder presumed to be due to an abnormal arousal function. Classical arousal disorders: sleepwalking, sleep terrors and confusional arousals.

  • Arousal Threshold

  • Ease that a sleeping person is awakened.

  • Arrhythmia

  • Irregularity or absence of the heart rhythm caused by disturbances in transmission of electrical impulses through cardiac tissue.

  • Auto Adjusting Continuous Positive Airway Pressure Device (SmartPAP) (Auto-PAP)

  • A type of CPAP machine monitoring changes in breathing and compensates automatically by making appropriate adjustments in pressure.

  • Automatism

  • Automatic action; especially any action performed apparently without intention or awareness.


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Sleep Related Terms






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