One thing that DH and i do and it seems to work for both of us is have one night where all the responsibility is his. Sounds a bit silly but from the moment he's home on a Fri he looks after the girls. I can go to bed as early as i like and he has to see to them if they wake etc. He also has to get up when they wake in the morning. He doesnt mind and i see it as my time off my JOB haha iykwim. Of course i'm still around if he needs a hand or something but its nice to go to bed and know i dont have to get up until my body is ready to wake up. Maybe you and shel could come to some arrangement similar. It helps me get through the tough nights (esp in the early days) knowing that i had a full nights sleep coming soon. HTH
Hoody