We put our 35 month old to bed at 6.30/7 but after we have left the room she very regularly will then get up again and play alone in her room for hours- 9.30/10 not uncommon (she is still up now). We have trained her not to leave her room and disturb us so it isn't too disruptive but I'm beginning to worry we are really sleep deprive her, or it is somehow a bit abnormal that she is so independent. Or are we just lucky?