Your question compelled me to answer, "YOU ARE NOT ALONE!" My son just recently, in the last 2 weeks, began to "sleep through the night", but for him, that constitutes one 6-8 hour stretch. He will be 2 in 2 weeks. Before that, he was up every hour, which stretched to every 2 hours, which gradually shifted to a 3-4 hour stretch and then every 2 after the first stretch, to 2 3-4 hours stretches back to back, and then, finally, it started to happen. I have two friends whose kids sleep 12 hours, and have been doing that since 6 months - I don't talk about sleep with them. Popular culture says that our kids should be sleeping, I've decided that popular culture, just like No Child Left Behind, does not allow for the individual differences there are between individuals. We're called individuals because we are exactly that: no two the same.
My son is a higher need kid. He needed that help to get back to sleep, and I gave it, and he eventually, of his own accord and will, began sleeping better when his body was capable of it. I set up a twin bed, and he eventually chose to sleep on that - the better sleep came after that transition.
There are still sleepless, restless nights. Some nights he moves and tosses and turns constantly, some nights he is in the same position for the entire 6-8 hours, some nights, when teething or sick, like the past two nights, he'll be up nursing frequently again. I've also taken a "one step forward, two steps back" attitude with sleep. That way I don't have an expectation that sleep will stay great once it seems to begin being better, but I know that it will get there.
I myself get up once to go the bathroom each night around 3. I expect that once my son is potty trained, I'm going to be a little more sleep deprived as he figures out how to get out of bed himself for the bathroom adn then put himself back to sleep.
I highly recommend No Cry Sleep Solution by Pantley and The Baby Sleep Book by Dr. Sears. They provide insight into sleep and helpful, baby stepped instructions on things you can gently do to ease your kiddo into sleeping better. I don't know that it actually worked before my son was ready, but I felt reassured that there would be progress eventually. In short, you are not alone. Good luck!
H.