Bunk Bed

We got the boys bunk bed put together. Luke took to it great and had no issues sleeping in it (on the bottom bunk). We let him get adjusted for awhile and then decided to try to get Nate to join him. The first night, Nate stayed in the bed for all of about 60 seconds before he climbed out (the rule is - if he gets out - he sleeps in the crib that night). Well, now the nightly routine is to read stories to both boys in Luke's room, say prayers (each one of us says a prayer - Nate's goes like this. "Thank you for everything, and thank you for everything, and thank you in Jesus name, pray... Amen!") and then we sing a couple of songs. Well, once we get to the song part, Nate starts to crawl out and say he wants to go sleep in the crib. This upsets Luke every time, because he REALLY wants Nate to sleep with him in the bed. It usually involves some type of physical scuffle where Luke tries to keep him in bed and Nate wants out. This has been going on for about 3 weeks now. I'm not sure how to get Nate on board with staying in the bed. So here is a quick video from the first night. Nate just wanted to talk, and Luke was pretty tired...