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  2. 8 Headphones You Can Comfortably Wear to Sleep - AOL

    www.aol.com/8-headphones-comfortably-wear-sleep...

    Sleep PROxs. Bonamour's sleep buds are upping the ante when it comes to incorporating the latest in sleep science. These teeny tiny buds connect to the Bonamour app, which has a library of ...

  3. All the best earbuds for every style and situation - AOL

    www.aol.com/10-best-earbuds-every-situation...

    They might be small and fiddly, but earbuds shouldn’t be taken lightly. Finding a good pair of buds is seriously tricky. If you're anything like us, you’ve probably gone through many pairs of ...

  4. The best wireless earbuds - AOL

    www.aol.com/news/best-wireless-earbuds-203936333...

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  5. Noise-cancelling headphones - Wikipedia

    en.wikipedia.org/wiki/Noise-cancelling_headphones

    Noise-cancelling headphones are headphones that suppress unwanted ambient sounds using active noise control (ANC). Active noise cancellation makes it possible to listen to audio content without raising the volume excessively. In an aviation environment, noise-cancelling headphones increase the signal-to-noise ratio significantly more than ...

  6. Headphones - Wikipedia

    en.wikipedia.org/wiki/Headphones

    Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound. Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open air for anyone nearby ...

  7. 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]

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