Wk 1 Lecture 2, Sleep Stages and Polysomnography

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20 Terms

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Polysomnography
The gold standard measure of sleep that records various physiological signals during sleep.
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Sleep Architecture
Refers to the basic structural organization of normal sleep, with each sleep stage having unique EEG characteristics.
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NREM
Non-Rapid Eye Movement sleep, which consists of three stages (N1, N2, N3) before transitioning to REM sleep.
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REM Sleep
Rapid Eye Movement sleep, characterized by increased brain activity and vivid dreaming.
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Sleep Cycle
The pattern of sleep that includes multiple cycles throughout the night, typically lasting around 90 minutes.
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Sleep Stages
States of consciousness during sleep, including stages N1, N2, N3 (NREM) and REM.
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EEG (Electroencephalography)
A method used to measure electrical activity in the brain to define sleep stages.
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Hypnic Jerks
Involuntary muscle contractions that may occur during the transition from wakefulness to sleep.
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Sleep Efficiency
Calculated as total sleep time divided by total time in bed, indicating how effectively sleep is achieved.
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Sleep Latency
The time it takes to transition from full wakefulness to sleep.
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Type 1 Polysomnography
An attended, in-laboratory sleep study using at least seven channels for comprehensive sleep assessment.
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Type 2 Polysomnography
An unattended, home sleep study that also uses at least seven channels for sleep measurement.
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Type 3 Polysomnography
Limited channel monitoring of breathing parameters without sleep assessment, typically using four channels.
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Type 4 Polysomnography
Limited channel monitoring with only 1-2 channels, typically measuring oximetry and possibly airflow.
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Cough Reflex Suppression
The reduction or absence of the cough reflex during sleep stages, particularly in NREM sleep.
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Physiological Signals
Various bodily measures recorded during polysomnography, such as EEG, EOG, EMG, ECG, and measures of airflow.
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Growth Hormone
A hormone released during deep sleep (Stage N3) that promotes growth and repair.
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Sleep Disorders
Conditions that disrupt normal sleep patterns, often diagnosed through polysomnography.
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Dynamic Behavior of Sleep
The understanding of sleep as a complex activity controlled by various mechanisms in the brain.
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Transition Period
The phase from wakefulness to sleep, particularly associated with Stage N1.