A Penn Medicine study challenges sound machine benefits, finding that "pink noise" disrupts deep sleep and REM cycles, while earplugs are proven more effective.

PHILADELPHIA -- Marketed as a ticket to deeper sleep, the soft hum of pink noise has become part of millions’ nightly routines. However, its use may come at the cost of sleep quality, a University of ...

Rather than promoting better quality sleep, pink noise and other ambient noises may harm sleep quality more generally.

Published last week in the medical journal Sleep, the study found that the presence of pink noise at night reduced REM (rapid eye movement) sleep – the stage when most vivid dreams occur and memory, ...

Sleep frequencies are the latest sound-based sleep trend promising deeper, more restorative rest. Here's how they work ...