Weekends I tend to stay up a bit later, rarely as late as midnight unless I am out though, and I usually sleep until 8 or sometimes 9am. The kids get themselves up, get their own breakfast and amuse themselves during this time. They also know not to disturb me as I am something of a bear with a sore head in the morning I need a lot of sleep and really struggled when the kids were not allowing me the 8 hours a night I need.
I'm in awe at your brilliance in child training!!