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White noise, I soon learned, is the gold standard for a reason, and the Homedics SoundSleep White Noise Sound Machine is the easiest-to-use, most portable option I found.

It can often sound like hissing or a “SHHHH” sound, similar to television or radio static. You may have even heard white noise machines in a doctor’s or therapist’s office.

The Homedics SoundSleep White Noise Sound Machine plays six sounds, including steady white noise, summer night, ocean, thunder, brook, or rain. Instead of using a dial, it has buttons for each ...