Masking those extraneous noises with sleep headphones seemed like a no-brainer. This led me to try the more expensive Manta Sound Sleep Mask, which costs $143. In addition to supposedly being ...
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We've always used 'white noise' for my son, and both my eldest and my husband also use 'sleeping sounds', creating a regular symphony of sounds from our landing at night, reports the Mirror.
However, a 33 NRR may not be totally necessary for sleep — the measurement is primarily used to gauge ear protection from potentially damaging sounds, such as loud machinery or music.