Sleep Yelling!

When Samuel was a baby he would cry in the mornings when he woke up and I would go in his room to get him (if he wasn't already in bed with us...i know, bad habit!) But when he got a little older, he would just fake cry b/c he knew that would make me come in his room. I explained to him, that when he woke up, he could just call my name softly and I would be able to hear him and that I would come get him. Over time, he started calling my name louder and louder in the mornings thinking that he had to yell in order for me to hear him. So, every morning I wake up to "MMMMOOOOOOMMMMMM, MMMMMOOOOOMMMMM!!" in his loudest voice that comes booming through the monitor and across the hall causing me to jump out of bed in a startle. Our room is only a few steps away from his and we have a monitor, so I can almost hear him breathe, so I continue to tell him that he doesn't have to yell and that he can just softly call my name and I will hear him. Well, this past week, he has been sleep yelling...meaning that usually sometime between 3 am and 5am, he will yell in his LOUD voice, "MMMMOOOOMMMMM", which startles me from my dreams and I stumble in to his room to see if he is okay, and I find him SOUND ASLEEP! Was I just dreaming that? So I go back to bed and maybe 5 or 10 minutes later, I hear the same thing, "MMMOOOOMMMM!", but this time I wait b/c I wonder if he is just doing it in his sleep again, but he yells it again, so I go in there and he is still sleeping!!!!! I even say his name softly to see if he is playing a trick on me, but he doesn't budge. I can't be dreaming b/c Kyle wakes up too, but I feel like I am going crazy! Each night this happens multiple times where he yells out and I run in to find him sleeping soundly. Then maybe around 5 or 6am, he will yell out again for me and he will actually be awake, so I carry him into our room so he can play with my hair, which helps him fall back to sleep for at least another hour. I just hope these little episodes fade away before his little brother is born, b/c I am getting tired just thinking about the sleepless nights I have ahead. Good night~