"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." You probably know about white noise, or have seen one of those humming machines outside a therapist's ...

I tried Amazon's popular Big Red Rooster machine, a white noise machine for people who can't sleep. The sleep machine has over 22,000 five-star ratings, and this is my personal review.

Sound machines may not be the sleep saviors many believe. Researchers found that pink noise significantly reduced REM sleep, while simple earplugs did a better job protecting deep, restorative sleep ...