2:30am, how I hate thee

The past three days, Cole has woken up at 2:30am screaming. Rob typically goes in there first and tries to comfort him. After about 10 minutes, he usually gives up and comes back to our room carrying a sleeping Zane. The boys share a room and he does this as a preventative measure to keep Zane from waking up. We let Cole scream for 15-20 minutes before I go in and see what I can do to comfort him. He usually calms down when I'm in there, but he refuses to go back to sleep. After a while I give up and go back to bed. Cole is back to screaming before I ever leave his room. We let him cry for a little while longer before one of us goes back in to comfort him. Repeat this process several times until Cole finally gives up and goes to sleep. Today, it was nearing 5:30 before Cole fell asleep and Zane woke up for the day.