Sleeping issues

For the past 4 or 5 weeks Bret has been having problems sleeping at night. I don't know if he has nightmares or if he senses a change coming or what....He sleeps great during his nap but it's a different story at night. We started the terrible habit of bringing him into bed with us and it's getting out of control.

Here is an example of what happens (3 or 4 X a week):

Go through the same routine EVERY night
Put him in bed
He whines a bit or sometimes even cries (which is not typical for him)
Falls asleep
In the middle of the night, I hear him either crying, whining or talking...saying stuff like "mine", "no", "mama", "dada", "go". Really funny but weird at the same time. I don't know if he's sleeping or not because I don't want to disturb him if he is
If he is awake then I try to keep him in his bed by rubbing his back or shushing him...if that doesn't work then I cave in and bring him into bed with us

I don't know what's going on and I don't know what else to do at 3 or 4am to keep him in his own bed. Especially when the baby comes home and is in a bassinet right next to our bed. I don't want Bret to be in our bed and for the baby to wake him up when it's time for a feeding.

Any advice?