all mine are 'night-owls', and so are more wakeful at night!!!
bedtime is 8pm, up at 7.30am. (for my 5yr old, later for the older ones by half-hour each)
if they go to bed earlier, and actually fall asleep (which is a rarity), then they would be getting up before 6am, which for me would be nightmare scenerio as I too am a night-owl and not good in the morning!!!