GitHub recently raised $100M from Andreessen Horowitz. CEO and founder of GitHub spoke a little bit on creativity and morale:

“For designers and developers building a new creative product, we don’t believe that an assembly-type nine to five really makes any sense,” Wanstrath said. “We built a lot of GitHub at 1 a.m., so why should anyone here be different? It’s all about having high morale. We think that makes better products. If people are enjoying their work, they’re going to be more creative. They’re going to be thinking about it in the shower and it’s going to be a better end result for the people using it.”