The auditory illusion can create a phantom tone in your head said to promote focus, relaxation, and cognition.

When two tones of slightly different frequencies are played in separate ears simultaneously (usually through headphones), the human brain perceives the creation of a new, third tone, whose frequency ...

I love taking naps, but taking one without feeling groggy afterward is rare. In fact, often, I'll wake up from a nap feeling even worse than I felt before. I found an app that helps me take 26-minute ...