This seems to be a popular question lately. Whenever my babies wake up at inopportune times, I just look up at heaven and say, "Are you joking? Hey, I need some divine help here a little! Could you send Sandman to my house tonight?" But, nope - He stays mute on the subject. Actually, the only bible verse I found on sleep is: The sleep of the Saints is sweet. So, I pray that, and claim it, for my kids and family every time I remember it.
Anyhoo, it's 9:26pm so I should get off to bed. I just put the babies to bed about 10 minutes ago. My 15 mo old has been waking up for the day regularly at 4:30-5am so, I've been trying to -stretch- out the day, delay naps, and bed time to push her back onto a later morning wake up schedule. So far, it hasn't worked... it's just made for long days over the past week and a half.
We can try all kinds of things that can work for a time and then all of a sudden due to teething, sickness, -a full moon, everything unravels. Time does take care of this problem no matter how unsuccessful we are at dealing with it. If you'd like to hear some more lame suggestions of mine other than, "deal with it for a time", just click on my name to read my post just prior to this one, it's on the same subject and how I'm really not much of a help to anyone on it.
All I know for sure is, they (most of them/us) do grow out of it and learn how to calm and settle themselves eventually. So, sorry, my attitude on the subject today is simply - you won't die of lack of sleep. And things might just not change for a while. There is worst that you could be going through.
Sleep is a big issue; I completely understand. I haven't had a full nights sleep in a long time. And how I cope to stay alive through it is this: I try to keep up on good nutrition (it's the first thing to slide when we are tired and we can get into a caffeen/sugar cycle that will make us crazy), and I try to sleep whenever the babies are sleeping (I let the house get messy, the flowers die, laundry piles up, and I miss the Dr. Phil show but, I nap in the afternoon when they take a nap whenever I feel like I'm "hitting the wall"). The end result is that I don't turn mean... I just live a little silly and I try extra hard to focus when I'm driving. So, that's it. That's all I've got. You might not sleep, but try to take care of yourself in every other way so, you only live half way insanely.