Hi Anita!
I don't want to discourage you, but I have an 18 mo old and almost 3 yr old who still don't sleep through the night. I am glad when they each only get up 1x/night. It took a long time just for that too. Some things I have tried were: cry it out (worked for my youngest, not my oldest), feeding them cereal before bed to pad their belly, co-sleeping, putting a fan on in their room for white noise, giving them a stuff animal/favorite blanket.
I know babies will get up when they are going to developmental milestones...learning to crawl, pulling themselves up, etc. Also, teething. My oldest teethed for months before she cut her first tooth.
Anita, you will gets lots of advice - I love this mamasource. One thing you have to remember as a Mom is you need to feel comfortable with whatever decision/advice you choose to use. A wise friend of mine told me that you have to make decisions that are best for your family. She specifically was talking about co-sleeping because so many people told me with my oldest I was making a mistake, I would never get her out of our bed, I need to just let her cry it out till she falls asleep. I realized that was not best to let my oldest cry it out because she would not fall asleep and the only way any of us got sleep was letting her sleep with us...ahh, we were finally getting sleep. I was breastfeeding her, and it make it so easy. She slept much better, hubby and I slept much better. When she turned a year old, we tried her crib and she did not have a problem. All babies and their parents are different and what works for one won't always work for another. Good Luck. Hope you get some sleep!