DH & I have started the co-sleeping discussions for #2 already, and DH's concerns are that I had nightmares of squashing DS even though we weren't co-sleeping! I agree with MamaPan - maybe have the discussion in the light of day when she's at her cutest

One thing that did work for us while I was on mat leave - and now that DH is the SaHD and I'm the f/t wage - is that the carer gets a night off each week - Saturdays worked best for us, as it gave a full night's sleep on "school nights" and the end of the "school week" to the f/t wage which we both agreed was really important. Now if DS is going through an annoying, whinging, crying patch, I'll ensure DH has a night or 2 of unbroken sleep - it really makes the difference to our relationship. It also means that he was more likely to help me early in the morning so I could get a little sleep.

Good luck.