With a 2am-ish wakeup, and the corrals releasing from 5-6am, unless you're used to being up and around for 3-4 hours and THEN running, you'll probably want something. It's very common for runners to bring some sort of easily portable breakfast into the corrals with them. I made instant oatmeal in a cardboard coffee "cup" during MW, and then took it to the race with me and ate it cold. Some people bring a bagel, a sandwich, etc. There isn't really a right or a wrong answer here, but more of a "what works for you, and will make sense to do on race day." The distance you're running (and your pace) can also factor in because your body generally has enough sugar stored up to get you through aa 5k or 10k, though you may feel better during and after with some fuel.
Do you usually run first thing in the morning? In the afternoon/evening? If it's afternoon/evening, is is like 'eat this meal, a few hours later have nuts/orange and then run' kind of thing? If it's the latter, then just mimic that in the morning and have breakfast at 2am, and then your usual snack in the corral.