Source, please. I have something more recent from him: Worked late last night, got insufficient sleep. Probably a net loss due to reduced efficiency today. http

Source, please. I have something more recent from him: Worked late last night, got insufficient sleep. Probably a net loss due to reduced efficiency today. https://twitter.com/ID_AA_Carmack/status/436349946732621825 https://twitter.com/ID_AA_Carmack/status/436349946732621825