(not quite) 24 hour party people

According to this report (in Chinese) about half (50.1 percent) of Shanghai's white collar workers have no "night life," meaning they don't go out at night. Most of those who do go out tend to go out 1-2 days per week, while a small fraction go out every night of the week. Most of those who do go out spend less than 300 RMB per month on their nocturnal activities. They usually take turns footing the bill, while a smaller portion go "AA" (each paying their share). Sixty percent of those who do go out are back at home by midnight. Their mothers would be proud.

Photo of how the better half lives by Peijin Chen.