I went through the same thing when my kids were little, I had a 1 and 1/2 year old and a new baby, the baby went to bed at 7:00 and woke up at 7:30, the other baby went to bed around 1-2 in the morning and got up around 8:00, I just had to get use to it, I would get up at 7:00 feed my baby girl and then she went back to bed at 11:00 and slept until 2:00, this went on until she was 4 years old, I would make the other child lay down when the baby went down for her nap, it was rough on me, but that was 16 years ago and I made it through, you have to learn to rest when they are, and go to bed earlier than you usually do, I have a granddaughter now that is almost two and she goes to bed every night at 8:00 and is up early, we have tried to put her to bed later, but she still gets up early.I wish there was something I could say to help you, but you just have to work your rest period and sleep around their schedule, good luck.