'Pink Noise' Might Help You Sleep Better

When you are asleep, your brain is still keeping tabs on the world outside. Sounds and even smells have been shown to alter brain activity during sleep.

"Evolutionarily, it makes sense," said Hong-Viet Ngo-Dehning, a lecturer in psychology at the University of Essex in the United Kingdom (U.K). "There might be some danger, and we need to respond." But some sounds might actually nudge us deeper into sleep.

In a recent paper in Science Translational Medicine, researchers report that when they played a type of sound called "pink noise" to people sleeping in an fMRI machine, they could see the fluid surrounding the brain pulsing in response. That might indicate that such noises could provoke changes in the quality of sleep.

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