I'm hoping for some advice and perspective please, wasn't sure whether to post here or breast and bottle feeding.
DD is 8 mo and was a great sleeper till 4 mo sleep regression hit. We never quite got over that but she would regularly sleep 8hrs or wake briefly and quickly settle.
Since 6 mo her sleeping has got worse and worse. She'll go to bed well at around 6.30-7ish but after 11 all bets are off!
We're very fortunate as DM and MIL live locally and will have DD overnight perhaps once a fortnight or so. I am BF'ing but DD will take a bottle.
Now when she stays out she sleeps brilliantly. For example, she stayed at MIL's on Sat and slept from 7.30-6.30 and didn't stir once 
Last night however I was up pretty much every hour with her and have been up since 4.30am.
DP is convinced it's BF'ing and that I need to wean her. I didn't really want to stop BF yet and am not convinced it will help but I'm back at work in 4 weeks and am worried that we're all going to be exhausted.
I can't help thinking that I'm doing something wrong but can't work out what?
Any advice would be fantastic thank you