Sleep more soundly with pink noise — a low-frequency version of white noise. Playing it while you sleep improves the quality of your zzz’s.
Here’s good news for light sleepers: Adding pink noise to your bedtime routine could help you sleep better. Similar to white noise, the pink variety has a lower frequency and sounds like gentler, more muted static. Researchers found that 75 percent of sleepers reported a more restful sleep when exposed to pink noise while they slept. Brainwave activity showed that stable sleep time of people listening to pink noise increased by 23 percent.
source: The Cleveland Clinic Wellness site