I can tell that there were at least one cossack guard in the corridor and another at the entrance to the corridor for the private apartments for the IF, upstairs and down. The baker worked overnight so that the breads and buns, rolls and pastries were ready before the Emperor arose. Laundry would have been done for the clothes from that day. Cooks, maids, servants, valets would be there very early so that everything would be ready the moment the IF arose from bed. There were probably at least perhaps 20 or so in staff working during the night hours, with several dozen more starting work well before dawn.