Getting a good night’s sleep is hard. A third of all American adults report getting less than the daily recommended amount of sleep nearly every night. Too little noise, and the mind starts to race.

Ask enough sleep nerds about the best sound machines and two very different front-runners will ultimately emerge: the Dohm and the LectroFan. The Dohm, sold by a company called Yogasleep, is a ...

If you’re easily disturbed by a noisy partner, a restless pet, or outside sounds, adding more noise to drown out what’s bothering you might be the answer. In a setting that is too quiet, those ...