Ours go in the bedrooms and are filled in the early hours of the morning (DH sets an alarm on his phone for about 4) so that when the boys wake up, if they are full they know that 'He' has been. The other year one of them came and woke me up at 3 am and said "there's all presents down stairs but our stocking are not full" and I had to say "He must have gone back up to the sleigh to get the rest of them, I bet he is on the roof right now, quick go back to sleep!" When they wake up and find them full they come and get us and rush down stairs and stockings get opened in with other presents.