DD is 10 months and has been having horrendous sleep for the past month. Regression + teeth I guess. Who knows. She's in a different room with a bed in it. No night feeds or anything for the past ages. She was sleeping through really well prior to this. 
We have ended up getting into that bed with her pretty much every night for the past month or she'd never go back to sleep at all.
So last night was the worst. She slept 7pm till 1, then woke up full of beans. Thrashing around smiling up at me in the cot. Same when I picked her up. So I lay down and she was awake and chatting and grabbing my face for about an hour and I finally got her into a deep enough sleep that I could transfer her back at 3am.
Then at 5 same thing happened. I didn't hear her, DH woke up and said she was standing up babbling happily. Same thing. Eventually he took her into the bed and again, endured an hour of her awake and grabbing his nose/ear/throat before she fell asleep around 6. They woke with the noise of everyone else getting up at 7.
Neither myself or DH can cosleep. Not that she sleeps for an hour anyway so nobody is sleeping during that anyway. But even when she does fall asleep, we can't.
So we are both shattered.
I suspect when this happens to other people they just cosleep the whole night. What happens when you can't? Have any of you any experience of going through similar? Do you just have to suck up the sleeplessness until they get through it?