so my son just turned 3 today!
I dont think I could do that.. locking him in - besides I think he would just scream and cry til we got him out which would wake my daughter up..
DD was the best of why she shouldn't take a nap. So I started to put things on time out toys stuffed animals and she finally got the ideal take a nap or you will sit in your room with nothing for a couple hours.
I wish he would sleep with us!
You might try hold off on bedtime a little while longer, maybe he will sleep til a normal (and somewhat more reasonable) time in the morning. Also, try to be consistent with bedtime. I have an almost 4 yr old and a 5 yr old and I try really hard to keep their bedtime schedule on track. Also, I don't know where you live, but you might let him run around outside to wear him out? Just thoughts...totally up to you!