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  2. 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 ...

  3. 8 Headphones You Can Comfortably Wear to Sleep - AOL

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

    Ahead, eight versions of sleep headphones that are doing it best, depending on your sleep and ear needs. Download a 12-hour long brown noise playlist and call it a night. Sleep Headphones

  4. Polyphasic sleep - Wikipedia

    en.wikipedia.org/wiki/Polyphasic_sleep

    Polyphasic sleep is the practice of sleeping during multiple periods over the course of 24 hours, in contrast to monophasic sleep, which is one period of sleep within 24 hours. Biphasic (or diphasic, bifurcated, or bimodal) sleep refers to two periods, while polyphasic usually means more than two. [1] Segmented sleep and divided sleep may refer ...

  5. Sleep apnea - Wikipedia

    en.wikipedia.org/wiki/Sleep_apnea

    Frequency. ~ 1 in every 10 people, [3][9] 2:1 ratio of men to women, aging and obesity higher risk [5] Sleep apnea, British English sleep apnoea or sleep apnœa, is a sleep-related breathing disorder in which repetitive pauses in breathing, periods of shallow breathing, or collapse of the upper airway during sleep results in poor ventilation ...

  6. Are Noise-Canceling Headphones Harmful to Your Ears? - AOL

    www.aol.com/noise-canceling-headphones-harmful...

    Key Takeaways: As the FDA does not regulate headphone volume, it’s up to us to self-regulate our listening volume. Noise canceling headphones can help keep your volume within a safe range, so ...

  7. What Happens to Your Brain When You Listen to Binaural Beats

    www.aol.com/happens-brain-listen-binaural-beats...

    Takeaway. In other words, the idea is that listening to binaural beats can trigger or elicit certain brain states, such as focus or a reduction in pain when listened to at certain frequencies.

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