大年初三，有安睡迟起的习俗，这和春节期间前几日的忙碌形成鲜明对比。春节假期步入第三天，大家都在新年的喜庆氛围里尽情放松。前几天，人们忙着筹备年货、贴春联、准备年夜饭，走亲访友也耗费不少精力，到了初三，就可以好好睡个懒觉。

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.