Light can impact sleep to a smaller or greater extent depending on the person. My research group studies this and has developed an app (Android-only for now) to

Light can impact sleep to a smaller or greater extent depending on the person. My research group studies this and has developed an app (Android-only for now) to let people test what affects their sleep the most, since sleep outcomes are so different for everyone (depending on chronotype, etc.). We use a form of Bayesian statistics to compute certainties and effect sizes after each night of sleep. https://play.google.com/store/apps/details?id=edu.brown.sleepcoacher https://play.google.com/store/apps/details?id=edu.brown.slee...