Steady background noise can mask sudden sounds that wake you up. Pink and green noise are often described as softer than white noise for winding down.

• StudyJournal of Clinical Sleep Medicine — auditory stimulation & sleep (systematic review)
• StudyFrontiers in Neuroscience — pink noise & sleep stability
• GuideSleep Foundation — can pink noise help you sleep?
• GuideSleep Foundation — what is green noise?
• VideoYouTube — Dr. Tracey Marks on pink noise & sleep

A predictable soundscape may ease racing thoughts at night by giving your mind something neutral to rest on instead of environmental surprises.

• GuideSleep Foundation — what is green noise?
• GuideCleveland Clinic — pink noise for better sleep
• StudyJournal of Clinical Sleep Medicine — auditory stimulation & sleep (systematic review)

Studies suggest white noise can help some infants settle and cry less — always use low volume, keep speakers away from the crib, and follow safe-sleep guidance.

• StudyPMC — white noise & sleep in newborns
• StudyPubMed — white noise vs. swinging in colicky babies (RCT)
• GuideBBC Tiny Happy People — white noise for baby sleep
• StudyPubMed — safe volume levels for infant sound machines

Moderate white or pink noise may help some people — especially those with attention challenges — by masking distractions. Effects differ for everyone.

• StudyHeliyon — low-intensity white noise & working memory (fMRI)
• StudyJournal of Science and Medicine — white noise & cognitive performance
• StudyPubMed — meta-analysis: white & pink noise in youth with ADHD
• VideoYouTube — can white noise help you focus?