A lot of the NWRs in Mississippi are the same way. Gates or ramps open at 4am and it's a mad rush. WMAs don't have that rule, so people just get there really early. We rolled up on one this past Saturday at 430am. Multiple groups already had decoys out in a flooded field and were rotating between sitting there to hold their spot and sleeping in their truck on the levee. The obscure timber hole we planned to hunt was already full too, so we had a .75mi hike in to an bayou. No sooner than we broke ice and set the decoys, 2 more groups walked in on us from the other direction a full hour before legal shooting light.
I won't complain though. Those kids are freaking dedicated to sleep on a levee in 20 degree temps for a handful of birds that may or may not show. 2 weeks ago we took my 15yo son into a hole,set decoys at 3am, and slept in the woods til daylight to give him a taste of the whole experience.