Yeah. These are the years you feel like a participant in a bad case study on sleep deprivation. I remember wondering if someone would find me babbling on the side of the road someday. I hope this anecdote turns those tears of yours to laughter, and that someday you'll look back on this time in your life and see the humor as well.
I have two children, both who were not "good sleepers." With our firstborn, we tried changing sleep schedules and routines, increased activity, decreased activity, co-sleeping, gently easing child back to sleep, etc. The pediatrician urged us to try the "cry-it-out" method. http://www.babycenter.com/0_baby-sleep-training-cry-it-ou...
I had heard of CIO but thought it was cruel and kept trying the gentler methods. I didn't read about CIO. My firstborn was also extremely strong-willed. When we tried our version of CIO with him, his nose would bleed when his crying escalated. He was really hard to break. Honestly, we never broke him. I'd always cave in and end up putting him in bed with us. Anything to get some sleep. Ugh! I'm embarrased to even write that, but it's true! LOL! Even with Jr. climbing into our bed we somehow, five years later, managed to have another child who started doing the same thing somewhere between 1 and 2 years old! When I begged for help this time (honestly, I think I was hoping there was a pill I could give them), the pediatrician laughed and said, "Wow, now you have two children keeping you up at night." That was eye-opening. I thought, she's right and enough of this foolishness! With one child, I had been sleep-deprived for five years. Couldn't see going to 10 years on 3-4 hrs. of sleep. (I was older and REALLY needed sleep!) That thought was more than enough to strengthen me through the CIO method.
One night, the baby was crying (she had to be around your child's age because she wasn't talking, yet), my 6-year-old son was whining about going to bed, and I blew up at everyone (including hubby) and said "If ANYONE wakes me up tonight, he's going to be sorry!" I walked right up to my screaming toddler, looked her right in the eyes and said, "STOP IT AND GO TO SLEEP--NOW." I entered my bedroom, slammed the door and went to sleep. The baby stopped crying. Jr. went to sleep in his own bed. I don't even remember if my husband came to bed. All I remember is that no one woke me up, including my hubby.
My children are now 11 and 6, respectively, and though they may wake to use the bathroom, they don't bother me...unless they're ill, which explains why my baby girl ended up in bed with us again last night. But, that's another message. LOL
Sometimes there's a medical reason for the chronic sleeplessness (teething, ear infection, asthma, illness, night terrors, gas, etc.) and sometimes the entire family just wants 24-hour access to Mommy, which is just not reasonable. But, as all writers have posted, make sure you rule out medical problems first before trying the "CIO" method. If I had read more about Dr. Ferber's method, I probably would have embraced it five years earlier. Ignoring the baby might take a week or two because she has learned that if she escalates her behavior, you and Daddy will respond. Be consistent, even if the two of you have to hold each other down to the bed. She has to learn to self-soothe for your own sanity. Prayerfully, you won't have to be as dramatic as I was and you'll be able to get some sleep again. And, even if you don't make it and cave in for the next few years, just know that it's ok, too. You'll survive and be able to share your own humorous anecdote with another crying, sleep-deprived mom on Mamasource.
Another thought: Google sleep trouble with 15-month old. Some really good articles. Here's one answer that might be helpful to you. http://answers.yahoo.com/question/index?qid=2008022211583...