CNN  —  Often described as one of the world’s most sleep-deprived nations, Japan repeatedly ranks last , or near last, in international surveys and studies on sleep duration and quality. One design firm has developed a creative solution that it believes can give real power to naps. Its “smart” puffer jacket concept is intended to optimize short naps by providing bespoke sound and lighting based on the user’s biometric data, such as heart rate and body temperature, which is gathered by a