Sleep Neurology Glossary

Relating to the transitional state of consciousness occurring during awakening from sleep to full wakefulness.

Physical or psychological reliance on sleep medications that impairs the ability to sleep without pharmaceutical assista...

The International Classification of Sleep Disorders, Third Edition, the standard diagnostic manual for sleep medicine.

Large amplitude, biphasic EEG waveform lasting at least 0.5 seconds that characterizes stage 2 NREM sleep.

Objective test measuring a patient's ability to stay awake during quiet, unstimulating conditions across multiple sessio...

Brief episodes of sleep lasting 1-30 seconds that occur involuntarily during wakefulness, often in sleep-deprived indivi...

Sleep-disordered breathing characterized by apneas that begin as central events but transition to obstructive events wit...

Standardized daytime sleep study measuring how quickly a patient falls asleep and enters REM sleep during scheduled naps...

Daytime sleep study measuring the tendency to fall asleep, used primarily to diagnose narcolepsy and assess excessive da...

Objective test measuring a patient's ability to stay awake in a quiet, comfortable setting during scheduled trials.

A chronic neurological disorder characterized by excessive daytime sleepiness and sudden, uncontrollable episodes of fal...

Non-rapid eye movement sleep comprising the deeper, more restorative phases of the sleep cycle.

A sleep disorder characterized by repeated upper airway collapse during sleep, causing breathing interruptions.

A decrease in blood oxygen saturation levels, commonly measured during sleep studies.

Category of sleep disorders involving abnormal behaviors, emotions, perceptions, or movements occurring during sleep or...

Sleep disorder characterized by repetitive, involuntary leg movements during sleep that cause significant sleep disrupti...

Measurement of periodic limb movements per hour of sleep, excluding movements associated with respiratory events.

Comprehensive overnight sleep study recording brain waves, breathing, heart rate, and muscle activity to diagnose sleep...

Quantitative measure of eye movement frequency during REM sleep episodes, expressed as movements per minute.

Comprehensive measure of sleep-disordered breathing including apneas, hypopneas, and respiratory effort-related arousals...

An increase in REM sleep duration and intensity following a period of REM sleep deprivation or suppression.

Parasomnia characterized by loss of normal muscle atonia during REM sleep, causing patients to act out their dreams.

Sleep disruption caused by increased breathing effort that doesn't meet criteria for apnea or hypopnea but still fragmen...

A neurological disorder characterized by an irresistible urge to move the legs, typically accompanied by uncomfortable s...