Hi, just saw this topic and it caught my attention because my ds is also 7 months old. I have to tell you- your family's situation is SUPER close to ours!!

Samuel is our third, his crib is in our room, we co-sleep when I fall asleep nursing him or when he can't resettle in his crib in the MOTN (but I agree-I sleep much better when he's in his own bed!), wakes a few to several times a night, is rolling around in his crib like a ball of yarn...CRAZY the similarities, I'm telling you!

I agree that two hours for A time is really short for 7 months, but no doubt it's from not resting well the night before, right?
No advice, really, just following along....
Oh, and (((Hugs))) on all the sleepless nights, hon!