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The Epworth Sleepiness Scale has been used to compare the sensitivity and specificity of other similar measurements of sleep quality. [8] [9] The Pittsburgh Sleep Quality Index is a related scoring tool of sleep quality. Both scores are internally highly reproducible. [10] The test has limitations that can affect the test's accuracy.
The component scores consist of subjective sleep quality, sleep latency (i.e., how long it takes to fall asleep), sleep duration, habitual sleep efficiency (i.e., the percentage of time in bed that one is asleep), sleep disturbances, use of sleeping medication, and daytime dysfunction. Each item is weighted on a 0–3 interval scale.
The respiratory disturbance index (RDI)—or respiratory distress Index—is a formula used in reporting polysomnography (sleep study) findings. Like the apnea-hypopnea index (AHI), it reports on respiratory distress events during sleep, but unlike the AHI, it also includes respiratory-effort related arousals (RERAs). [1]
The AHI is calculated by dividing the number of apnea events by the number of hours of sleep. The AHI values for adults are categorized as: [1] [2] Normal: AHI<5; Mild sleep apnea: 5≤AHI<15; Moderate sleep apnea: 15≤AHI<30; Severe sleep apnea: AHI≥30; For children, because of their different physiology, an AHI in excess of 1 is considered ...
The Stanford Sleepiness Scale (SSS), developed by William C. Dement and colleagues in 1972, is a one-item self-report questionnaire measuring levels of sleepiness throughout the day. The scale has been validated for adult populations [ 1 ] and is generally used to track overall alertness at each hour of the day.
A study on circadian rhythms that requires four screening visits, a regular sleep schedule for two to four weeks and a five-day stay in the sleep research laboratory pays up to $1,800.
Sleep efficiency (SE) is the ratio between the time a person spends asleep, and the total time dedicated to sleep (i.e. both sleeping and attempting to fall asleep or fall back asleep). It is given as a percentage. [1] SE of 80% or more is considered normal/healthy with most young healthy adults displaying SE above 90%.
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