Valuable first job - Software Engineer Uber Employee Review

Work life balance can get a little crazy. I have spent a few late nights at the office (latest was 4am one night). While the management encourages to get a good amount of sleep each night, they also stress for employees to find their "Red Lines" and to push themselves past that if possible. I am all for improvement, but I don't know if more time spent will really have better results. It seems as though time spent is worn as a badge of honor in this office, and all I can do is question if they understand diminishing return. As this is my first job out of college, I am unsure if this is common practice or just the culture of Uber.