No, six hours of sleep isn’t enough for almost all of us, explains sleep expert and Rise Science Co-Founder Jeff Kahn. It might not feel too far off the often recommended seven to nine hours of sleep, but even a small amount of sleep deprivation can have huge impacts on your energy, productivity, and health. To work out how much sleep YOU need each night, turn to the RISE app. The app uses sleep science algorithms and your personal phone use behavior to work out the amount of sleep you uniquely need.