My DD is 7 months, she has a good bedtime routine and settles in her cot initially -she'll wake normally every 1-2 hrs and when she does she's normally BF back to sleep or my husband cuddles and walks with her until she settles.
From about 2:30 onwards she will be unsettled to the point that I'm up and down constantly, if it happens more than 3 times consecutively I'll take her into the spare room with me (we have a standard double and it's more comfy this way- so I thought !) if DH wakes he'll move -either or !
Normally when we've coslept in the past (at some point all but 3/4 nights since she was born!) she's just BF when she wants and gone back to sleep next to me, now she seems to be waking ALL the time through the night, feeding for a second, going to sleep for minutes and waking again.
I'm really concerned because cosleeping was supposed to be my ticket to maintaining a good level of sleep (for both her and me!) maybe I was naive in thinking this 
TIA