It's likely okay to keep brown noise on throughout the night, but there isn't enough scientific evidence to back this up for certain. Current color noise research shows that it may improve sleep quality by potentially masking environmental noises, which helps to reduce awakenings. It's likely okay to keep brown noise on throughout the night, but there isn't enough scientific evidence to back this up for certain. Current color noise research shows that it may improve sleep quality by potentially masking environmental noises, which helps to reduce awakenings.