Office workers sleeping on the job has long been a common sight in China, where inefficiency and a surplus of cheap labour can give workers plenty of downtime in many industries.
But China's technology sector is different. Business is booming faster than many start-up firms can hire new staff, forcing workers to burn the midnight oil to meet deadlines.
Programmer Xiang Shiyang, 28, works until 3 or 4 a.m. at least twice a week at Renren Credit Management, which uses big data to help firms manage financial risk, leaving little room to socialize outside of work.
"I don't have that many opportunities or much time to find a girlfriend," he said.
The company provides cots for workers like Xiang to sleep on during late nights.
"Actually working overtime is a very casual thing," he said. "Because I've invested the whole of my being into this company."