I have a 3.5 year old and a 20 month old they sleep in the same room. I was told by Tweedle sleep school to leave them in there room until a certain time you are happy with. My kids i knew needed sleep, So i set my time for 730.. So even now the kids wake they know that they stay in bed.. either talk to each other etc.. Until I come open the door at 7:30. They also both go to bed at 730 and nap during the day for 2-3 hours.

They are much happier kids having been well rested and not overtired.

Good luck.