New research shows that a rainbow of soothing sounds may improve your sleep. But is there more to the picture than what meets the eye? Different sounds vibrate at different frequencies, forming noise colours. White noise is the most popular colour noise. It sounds like the static of a TV or radio. People use it to drown out distractions, whether to work or sleep. Meanwhile, other colour noises like pink, brown, and green are making a lot of buzz. Pink noise sounds like light rainfall or rustling leaves. It is garnering popularity over promises of improving sleep. But can it fulfil that promise? Is there enough scientific evidence to prove that colour noise helps you focus and sleep? Is it harmful to use colour noise? Palki Sharma tells you.