Waking up at 4 AM is a pretty big deal.
1. You get so much done in the morning that you don't have to stress about it later in the day.
2. It feels great to be up while the rest of the world is still asleep! It's like a secret club that only you know about.
3. You are better equipped to be productive than anyone else around you because they're still asleep and probably won't be for another few hours (or more).