Is pink noise the new white noise? It just might be, according to a new study.

White noise is anything that gives you a consistent sound throughout the night to help you sleep. This could be anything from a fan, air purifier, or white noise machine, according to the National Sleep Foundation.

Read: Sleep Deprivation: 5 Ways It Can Affect Your Mind And Body

But, a new small study, published in Frontiers in Human Neuroscience, shows pink noise may be even more effective than white noise. Pink noise is said to resemble water and sound more balanced and natural than white noise, TIME reports.

The study involved 13 older adults with an average age of about 75 years old, who spent two consecutive nights in a sleep lab. During one of those nights, the participants listened to pink noise through headphones.

Their memory was assessed both nights by a test they were given before bed and asked to repeat in the morning. Turns out, the pink noise not only helped with deeper sleep, but those who listened to it had better memory recall.

The pink noise effectiveness relies on timing, senior author Dr. Phyllis Zee told TIME. The sound was played through headphones when the subjects were in a slow, deep sleep. This was determined by electrode caps the participants wore that detect brain waves.

The authors note this is a small study and that more research should be done to determine the long-term effects of using pink noise to boost memory and improve sleep.

A noise machine may be just the thing to provide that quiet, undisturbed rest you need that's key to healthy sleep, according to the National Sleep Foundation.

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