守岁(守歲) (Shou Sui) occurs when members of the family gather around throughout the night after the reunion dinner and reminisce about the year that has passed while welcoming the year that has arrived. Some believe that children who Shou Sui will increase the longevity of the parents. 一夜连双岁，五更分二年 means that the night of New Year#39;s Eve (which is also the morning of the first day of the New Year) is a night that links two years. 五更 (Wu Geng – the double hour from 0300 to 0500) is the time that s
The rest is here:
Shou Sui in Chinese(守岁)
