What is sleep?

Sleep's been a rarity for me since the third trimester of pregnancy on. When Jane was born she woke up to eat twice at night and slept quite a bit during the day but once she was about 2 months old she started sleeping less and less and now, at 8 months she takes a one hour nap during the day if I'm lucky and wakes up every couple of hours at night crying and wanting to take a few sips of formula. I don't know if she's hungry or just wants the comfort of that bottle but she wakes up and interrupts our sleep. We expected sleepless nights while having babies but not like this. I read about letting your baby cry-it-out - ask my neighbors if they'd like that - giving her the pacifier (that doesn't help, she still cries until she tastes the formula) or trying to ignore the cry for a few minutes, soothe her and then let her cry again for a bit. I'm willing to try this last one but having David work so much is pretty much not an option right now. He needs all the sleep he can get so I always try to give her the bottle as quickly as possible. This routine has really taken a toll on me and now that I'm pregnant again I find myself tired, irritated and even depressed at times. I need a good night's sleep. Jane sleeps with us right now because we didn't have a crib. We got a crib now but we're waiting to move before unpacking it. I hope that having the crib will help but I'm worried that I won't get to sleep at night even more then, not having her with me and knowing that she's ok. Plus, whenever she'll be crying I'd have to go all the way to another room to see what's wrong. I don't know what to do and how to treat this situation... I really need some rest.