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  2. Sleep cycle - Wikipedia

    en.wikipedia.org/wiki/Sleep_cycle

    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]

  3. What Is Deep Sleep? Understanding the 4 Sleep Cycles & Why ...

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    Deep sleep refers to slow-wave sleep — a stage in the sleep cycle when brain waves slow down. Getting enough deep sleep is crucial for numerous bodily functions. But how to increase deep sleep ...

  4. Sleep - Wikipedia

    en.wikipedia.org/wiki/Sleep

    The sleep cycle of alternate NREM and REM sleep takes an average of 90 minutes, occurring 4–6 times in a good night's sleep. [15] [20] The American Academy of Sleep Medicine (AASM) divides NREM into three stages: N1, N2, and N3, the last of which is also called delta sleep or slow-wave sleep. [21]

  5. Sleep and learning - Wikipedia

    en.wikipedia.org/wiki/Sleep_and_learning

    During a normal night of sleep, a person will alternate between periods of NREM and REM sleep. Each cycle is approximately 90 minutes long, containing a 20-30 minute bout of REM sleep. [7] NREM sleep consists of sleep stages 1–4, and is where movement can be observed. A person can still move their body when they are in NREM sleep.

  6. 7 Ways to Improve Your "Sleep Hygiene" & Get a Good ... - AOL

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    Sticking to this regular sleep schedule also promotes deeper, more restorative sleep cycles, helping you rest, repair, and recharge. Drazen Zigic/Istockphoto Create a Sleep-Promoting Environment

  7. Ultradian rhythm - Wikipedia

    en.wikipedia.org/wiki/Ultradian_rhythm

    The Oxford English Dictionary's definition of Ultradian specifies that it refers to cycles with a period shorter than a day but longer than an hour. [1] The descriptive term ultradian is used in sleep research in reference to the 90–120 minute cycling of the sleep stages during human sleep. [2]

  8. When is the best time to wake up? The ideal waking time ...

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    What’s considered early will depend on the individual and their sleep cycle — for some it may be 5 a.m. and others, 8 a.m. ... "The problem is that the process of waking up is a complicated ...

  9. Rapid eye movement sleep - Wikipedia

    en.wikipedia.org/wiki/Rapid_eye_movement_sleep

    In the ultradian sleep cycle, an organism alternates between deep sleep (slow, large, synchronized brain waves) and paradoxical sleep (faster, desynchronized waves). Sleep happens in the context of the larger circadian rhythm , which influences sleepiness and physiological factors based on timekeepers within the body.