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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. I Have Teeny Little Ears and These Earbuds *Actually* Stay Put

   www.aol.com/lifestyle/teeny-little-ears-earbuds...

   Invisible Earbuds. Invisible is the perfect name for these teeny earbuds. They're barely noticeable unless you're aware that they're there. They slip into the ear and stay there. As a low-budget ...

5. 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.

6. ASMR - Wikipedia

   en.wikipedia.org/wiki/ASMR

   ASMR. An autonomous sensory meridian response (ASMR) [2][3][4] is a tingling sensation that usually begins on the scalp and moves down the back of the neck and upper spine. A pleasant form of paresthesia, [5] it has been compared with auditory-tactile synesthesia [6][7] and may overlap with frisson. [8]

7. 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 ...