We are having the same problems with my 3 yo at the moment. I think we were able to avoid it earlier as we put a baby gate on his room and he felt no need to get out of bed. We had to remove the baby gate as he learned to climb over it.
So now we have an overtired little boy who refuses to stay still, when he does stay still he is asleep in less than a minute.
We have tried lying with him but this just seems to over stimulate him, I have tried sitting at his door but he thinks that's a great game, I also take away toys from him for the next day, this use to work great but now he doesn't seem to care when hes over tired. At the moment I leave his room and walk him back to bed without talking until he exhausts himself and finally goes to sleep. By this time i'm ready for a wine
Interested to hear what others are doing?
He doesn't have a sleep unless at school (Bed time is a lot later on these days), and he usually sleeps 11hrs.