What keeps you up at night? Pondering deep questions? Excitement about a big trip? Stress about unfinished work? What if the very thing keeping you awake was stress about losing sleep? This seemingly unsolvable loop is at the heart of insomnia, the world’s most common sleep disorder. So what is insomnia? And is there any way to break the cycle? Dan Kwartler details the science of insomnia.

是什么让你夜不能寐？思考深奥的问题？为一次大旅行而兴奋？为未完成的工作而感到压力？如果让你保持清醒的东西就是失眠的压力呢？这个看似无解的循环是世界上最常见的睡眠障碍--失眠症的核心。那么什么是失眠症？又有什么方法可以打破这个循环吗？丹-夸特勒详细介绍了失眠的科学原理。