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  2. Doctors Say This Type Of Noise Is Best For Deep Sleep - AOL

    www.aol.com/doctors-type-noise-best-deep...

    Over 14 percent of adults have trouble falling asleep most days, ... “Most of the time, when sleep noise helps, it’s because it’s masking extra sounds—such as a slamming door, car horn, or ...

  3. Delayed sleep phase disorder - Wikipedia

    en.wikipedia.org/wiki/Delayed_sleep_phase_disorder

    Patients have a relatively severe to absolute inability to advance the sleep phase to earlier hours by enforcing conventional sleep and wake times. Sleep–wake logs and/or actigraphy monitoring for at least two weeks document a consistent habitual pattern of sleep onsets, usually later than 2 am, and lengthy sleeps.

  4. Music and sleep - Wikipedia

    en.wikipedia.org/wiki/Music_and_sleep

    Interventions including music-assisted relaxation and listening to music effectively reduce sleep onset latency for people with insomnia. [14] However, several studies found music to have neither positive nor negative effects on subjective sleep quality for normal individuals. [15] [16]

  5. National Sleep Foundation - Wikipedia

    en.wikipedia.org/wiki/National_Sleep_Foundation

    NSF Sleep Duration Recommendations Chart developed based on NSF's research paper [3] In 2015 NSF released the results of a research study on sleep duration recommendations. [4] The paper titled "National Sleep Foundation's sleep time duration recommendations: methodology and results summary" was published in the peer-reviewed Sleep Health ...

  6. Is 4 hours of sleep enough? What sleeping too little does to ...

    www.aol.com/news/4-hours-sleep-enough-sleeping...

    Experts explain what happens to your body when you sleep four hours, health effects of sleep deprivation and tips to improve sleep. ... 11–14 hours, including naps. Young children (3–5 years ...

  7. Advanced sleep phase disorder - Wikipedia

    en.wikipedia.org/wiki/Advanced_sleep_phase_disorder

    Advanced Sleep Phase Disorder (ASPD), also known as the advanced sleep-phase type (ASPT) of circadian rhythm sleep disorder, is a condition that is characterized by a recurrent pattern of early evening (e.g. 7-9 PM) sleepiness and very early morning awakening (e.g. 2-4 AM).

  8. Sleep cycle - Wikipedia

    en.wikipedia.org/wiki/Sleep_cycle

    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] Within the sleep of adults and infants there are cyclic fluctuations between quiet and active sleep.

  9. Audio frequency - Wikipedia

    en.wikipedia.org/wiki/Audio_frequency

    16 to 32 1st The lower human threshold of hearing, and the lowest pedal notes of a pipe organ. 32 to 512 2nd to 5th Rhythm frequencies, where the lower and upper bass notes lie. 512 to 2,048 6th to 7th Defines human speech intelligibility, gives a horn-like or tinny quality to sound. 2,048 to 8,192 8th to 9th