Most significantly, he said about 20 studies involving more than a million people have shown that long sleepers have a greater risk of dying than do those who sleep less.

• 更重要的是，扬斯戴特指出，在大约二十个研究中总共超过一百万名受试者的结果皆显示，长时间睡眠者的死亡率比睡眠较少的人更高。