Have you ever heard of “pink noise”? Pink noise is the same background sound as white noise, but while white noise has equal energy at all frequencies, pink noise has more energy at lower frequencies and is closer to the sounds of nature.
A study in which university students listened to different types of pink noise, including rain, ocean waves and heartbeats, one hour before bedtime, found that they self-assessed better sleep quality, fewer sleep interruptions, and better daytime energy.
