睡眠是恢复身心健康的关键，深度睡眠促进记忆与学习，提升生活质量。八国联军

　　Sleep has long been regarded as nothing more than a way to charge our batteries. But what if it can control our weight, allow us to make memories, and help us to fight off diseases like Alzheimer’s? We travel the world to investigate how revolutionary new technology has revealed the sleeping brain as an energetic and purposeful machine.