When I watched him live I believe it was more like 0400ish when those particular people were filmed. Not an unusual hour to head into work, especially if you have to be bused in to the area then go through check points. I imagine there are all kinds of support jobs that need to set up long before regular employees...janitors & food service for example. It's like a self contained city in the capital bldg area with restaurant, salon, gym etc.