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Slow-wave sleep (SWS), often referred to as deep sleep, is the third stage of non-rapid eye movement sleep (NREM), where electroencephalography activity is characterised by slow delta waves. [2] Slow-wave sleep usually lasts between 70 and 90 minutes, taking place during the first hours of the night. [3]
The sleep cycle is an oscillation between the slow-wave and REM (paradoxical) phases of sleep. It is sometimes called the ultradian sleep cycle, sleep–dream cycle, or REM-NREM cycle, to distinguish it from the circadian alternation between sleep and wakefulness. In humans, this cycle takes 70 to 110 minutes (90 ± 20 minutes). [1]
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]
Effects of sleep deprivation on cognitive performance. The effects of sleep deprivation on cognitive performance are a broad range of impairments resulting from inadequate sleep, impacting attention, executive function and memory. An estimated 20% of adults or more have some form of sleep deprivation. [1] It may come with insomnia or major ...
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Target is the latest mega-retailer to throw their hat in the ring next month. Announced earlier this week, Target Circle Week is headed our way. This year, the savings event will run from Sunday ...
US$ 249.1 million (2015) [2] Number of employees. ~500 (2015) Parent. Ziff Davis. Website. www .retailmenot .com /corp /. RetailMeNot, Inc. (formerly Whaleshark Media) is an American multinational company headquartered in Austin, Texas, that maintains a collection of coupon web sites. The company was founded by Cotter Cunningham. [3]
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