In an effort to revitalize fantasy sports, Henry Leung, Ken Wang, Nan Wang, and Weixi Yen developed an app called Sleeper in 2018.
The Sleeper app is free from advertising and features a social media platform for chatting with other users.
In 2019, the company surpassed 1 million users and added fantasy basketball sports that same year. Using its Series B investment, Sleeper has launched a season-long fantasy League of Legends game for professional LoL circuits in North America, Europe, Brazil, Korea, and Vietnam.
Co-founder and CEO Nan Wang says that the company is negotiating with NASCAR and Penn National regarding creating a fantasy auto racing series.
Sleeper maintains a corporate office in San Mateo, California.