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Sleep duration measures the length of sleep, whereas sleep quality includes factors such as speed in falling asleep and whether sleep is unbroken. [ 118 ] [ 119 ] Low quality sleep has been linked with health conditions like cardiovascular disease , obesity , and mental illness .
Sample hypnogram showing one sleep cycle (the first of the night) from NREM through REM. 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 ...
Sleep deprivation, also known as sleep insufficiency [2] or sleeplessness, is the condition of not having adequate duration and/or quality of sleep to support decent alertness, performance, and health. It can be either chronic or acute and may vary widely in severity.
You also need adequate sleep duration, meaning staying asleep for a long stretch, ideally at least seven hours. ... “Ensuring adequate sleep duration and good sleep efficiency will allow your ...
Shorter sleep duration, besides its association with cognitive decline, is also linked to an increased risk of high blood pressure. Moreover, studies show that high blood pressure in midlife is ...
The studies eventually led Dement and Carskadon to conclude that "the brain keeps an exact accounting of how much sleep it is owed". [1]: 60 Not getting enough sleep during any given period of time leads to a phenomenon called sleep debt, which lowers sleep latency scores and makes sleep-deprived individuals fall asleep more quickly.
The relative amount of REM sleep varies considerably with age. A newborn baby spends more than 80% of total sleep time in REM. [54] REM sleep typically occupies 20–25% of total sleep in adult humans: about 90–120 minutes of a night's sleep. The first REM episode occurs about 70 minutes after falling asleep.
Several studies have shown that sleep duration, specifically sleep deficit or shorter sleep duration, predicts mortality, whether it be on weekdays or weekends. [7] In people aged 65 years and younger, daily sleep duration of 5 hours or less (amounting to a sleep deficit of 2 hours per day) during weekends correlated with a 52% higher mortality ...