H.Z.
I don't think the question is "has anyone been through this", but more like has anyone not been through this??? I have three boys and they all went through this stage. It is very normal...even with the "good" sleepers. And just remember this too shall pass. He is just excited that he can see the world from a different angle and doesn't want to miss a beat. I would just go in there every 5-10 minutes and lay them back down, resettle them and leave the room without really speaking. After awhile they got the hint that it really and truly was sleep time. And they all went back to being "good" sleepers...my youngest one is even better now!
Good luck!
H. (SAHM to 3 boys 4 1/2, 3 1/2 and 12 mths old)