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2. 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

3. 9 Waterproof Earbuds for Everything From Swimming to ... - AOL

   www.aol.com/9-best-waterproof-headphones...

   For whichever sweaty, water-logged places you find yourself, here are the 9 best waterproof earbuds and headphones—with MP3 storage, Bluetooth, or both.

4. These Waterproof Earbuds Are a Must-Have for Your Beach ... - AOL

   www.aol.com/waterproof-earbuds-must-beach-pool...

   From work calls to long runs, it's important to use quality waterproof earbuds and headphones. Shop these 8 waterproof options for daily use.

5. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   Noise -cancelling headphones alongside a carry case. Noise-cancelling headphones are headphones which suppress unwanted ambient sounds using active noise control. This is distinct from passive headphones which, if they reduce ambient sounds at all, use techniques such as soundproofing . Noise cancellation makes it possible to listen to audio ...

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. Unihemispheric slow-wave sleep - Wikipedia

   en.wikipedia.org/wiki/Unihemispheric_slow-wave_sleep

   Unihemispheric slow-wave sleep ( USWS) is sleep where one half of the brain rests while the other half remains alert. This is in contrast to normal sleep where both eyes are shut and both halves of the brain show unconsciousness. In USWS, also known as asymmetric slow-wave sleep, one half of the brain is in deep sleep, a form of non-rapid eye ...