Sleepless nights!

My little girl turned one in March and still wakes for bottles during the night.  She wakes at least twice a night.  My partner and I are at the point where we will try anything for a full night's sleep.  It's getting to be a real problem.  We also have a three year old daughter who is in play school and some mornings we are so exhausted that we wake up late and then she misses school which is totally unfair for her as she loves school.  My one year old also cries a lot in the day if she wants me to pick her up and I refuse.  This happens on a daily basis and is getting very hard to deal with.  She's very demanding and jealous.  If myself or my partner is doing something with our three year old, the one year old will cry and try to push her sister away from us.  It's getting very stressful and we need advice.  Help!!!