Light sleep makes up a significant portion of our rest but the term might cause alarm in some if they think they’re getting too much “light sleep” and not enough “deep sleep.” Sleep trackers label it ...

Valued for portability and low cost, fNIRS has a major drawback: it can't see very deep into the brain. Light typically only reaches the outermost layers of the brain, about 4 centimeters deep ...

Using passive design approaches that require no additional energy, the firm is finding innovative ways to bring more natural light deeper into office buildings. [Photo: Robert Benson/courtesy CBT ...