Pink noise is a type of noise that contains a random assortment of all the audible frequencies, with more power in the lower frequencies. It is often used as a tool to help people relax for sleep by masking bothersome sounds. Pink noise is similar to white noise, but it uses deeper sounds and lower sound waves, so it may be gentler and more soothing. Here are some ways pink noise is used:

• Sleep: Pink noise can help reduce the difference between the background hum and loud, jarring noises that can jolt you out of sleep, like a door slamming, a car horn honking, or someone snoring. So it may help you fall asleep faster and keep you in a deep sleep longer. You may also feel more rested when you wake up.

• Relaxation: Pink noise is often considered more relaxing than white noise, since it does not sound as high-pitched. Pink noise is prevalent in nature sounds, like wind and rain, and many songs or segments of speech contain elements of pink noise. Researchers have observed patterns similar to pink noise in short segments of birdsong, as well as in some urban soundscapes.

• Therapy: Pink noise is often used as a tool to treat hearing disorders and tinnitus (a ringing in the ears). Brown noise, which is deeper and more bass-like than pink noise, has been used in therapy for its calming and relaxing effects.

Overall, pink noise is a useful tool for promoting relaxation and sleep, and it may have therapeutic properties. However, more research is necessary to fully understand its benefits and how it works.