Many sleep scientists say that the most natural sleep for people is divided into two parts: night and at noon. The polyphasic sleep is directed to people who ca

Many sleep scientists say that the most natural sleep for people is divided into two parts: night and at noon. The polyphasic sleep is directed to people who can't afford such amount of sleep for example because of their work. They can try the polyphasic sleep for some time. That's why this kind of sleep is only some NeuroOn functionality. In biphasic or monophasic sleep modes (as you said, the natural for people) this device helps you by waking up gently avoiding doing it during deepest sleep. That's why it is much more pleasant than using normal alarm clock.