Sunrise Safari is on Thursday and Sunday mornings. You will check in at the Lounge before 7pm -- they have to swipe your passes since park admission is required. You'll meet your Guides in the lobby around 7:15; then board the bus for AK.
It's the Kilimanjaro ride with many photo opportunities (they stop the vehicle often) and lots of information (they encourage questions).
After the Safari, the group makes its way to Pizzafari -- it is often close to 9am by then.
The breakfast is fabulous -- in a private room at Pizzafari and absolutely worth the price of admission!

The Guides stay and mingle and it's a great opportunity to get some wonderful information about the animals from the experts (and they truly are experts!).
I have done it multiple times and each time has been a unique experience.