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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. Lagophthalmos - Wikipedia

   en.wikipedia.org/wiki/Lagophthalmos

   Lagophthalmos. Lagophthalmos is the inability to close the eyelids completely. [1] Blinking covers the eye with a thin layer of tear fluid, thereby promoting a moist environment necessary for the cells of the exterior part of the eye. The tears also flush out foreign bodies and wash them away.

5. Ganzfeld effect - Wikipedia

   en.wikipedia.org/wiki/Ganzfeld_effect

   The visual effect is described as the loss of vision as the brain cuts off the unchanging signal from the eyes. The result is "seeing black", [ citation needed ] an apparent sense of blindness. A flickering ganzfeld causes geometrical patterns and colors to appear, and this is the working principle for mind machines and the dream machine .

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

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

   The good news is that noise-canceling headphones can benefit your ears in certain situations. A few of those situations could be blocking out background noise in a busy coffee shop, blaring ...

7. Take 20% Off Raycon Earbuds, Headphones and Speakers ... - AOL

   www.aol.com/entertainment/20-off-raycon-earbuds...

   These Basic Earbuds. The Work Earbuds Classic. Raycon. For everyday wear that’s easy to take in and out, these buds are the perfect pick! See it! Get The Work Earbuds Classic (originally $120 ...