He mentions having switched to biphasic sleep. If he said- I don't use electricity at night and just go to bed and wake up with the light, then if he got up during the dark hours, that's fine. But scheduling it and forcing your body into a strange deprived sleep pattern is bad for you. Napoleon slept ~4 hrs a night. He was successful for a time, well- except for attempting and failing to conquer the world. Poor decisions may not have been made with more sleep.
http://en.wikipedia.org/wiki/Biphasic_sleep
So, that leads us up to the 30/30 work cycle. This actually doesn't sounds that bad. But, it is totally not something that would work in a professional setting. When you are in the middle of an important meeting with the board, or working on getting a product feature out that day, you can't walk out of the meeting or walk out on your team to go play video games. I take time out periodically for a walk, but seriously- grow up.