I've read many sleep books in my day - independent sleeping, co-sleelping, no crying, crying, etc. After much research, I found that for me, the one that made the most sense and (gratefully) worked like a charm for my kids was Ferber's "Solve Your Child's Sleep Problems." And before anyone starts protesting at how cruel that Ferber cry-it-out thing is, all I can say is - those people haven't read the book. I actually found it to be very doable and not cruel at all. If you want kids who sleep with you forever and wean themselves from you gradually - this is not your book. But if you want to establish good, healthy, independent sleep patterns, this book is the best. My three breast fed kids were sleeping through the night (7pm - 7am) at 7, 4 and 3.5 months respectively. There are different methods for younger babies, but by about 5 months, most children are ready for sleep training.
I'll give you a brief idea of what the method is. If you want more detail, seriously - get the book - best investment I ever made. Or you can message me - I'm happy to help. The basic idea is that you need to eliminate anything your child uses to fall asleep that requires your intervention in the middle of the night. They need to learn to fall asleep on their own with no eating, rocking, music, etc. The reason for this is that everyone - even adults - wake up throughout the night. If babies are used to eating to fall asleep, they will need that again & every time they wake. The solution is to slowly train them how to soothe themselves. You have a nighttime routine that is consistent to signal to the child that it's time for bed. You place them in their crib and leave the room. When they start to cry, stay out of the room for a couple of minutes (it doesn't matter how long - as long as the intervals increase...I always started with just 2 minutes). Then you go back in and comfort them as much as you can WITHOUT picking them up. You can rub their back, talk or sing to them, or lay them back down. After a few minutes, even if they are still crying, you leave again and increase the amount of time you are gone by a bit (I would only increase by one minute each time). Repeat this process. You will find that your child learns that if they cry long enough, you will always come back - they don't feel abandoned, they feel in control. They just realize that at some point, it's not worth crying for that long to make it happen.
Do that every time you put your child to bed - even in the middle of the night or for naps. You will find that each day they cry for less & less time. After about a week or two, all 3 of my kids were sleeping through the night without waking and I could put them in their crib, give them a little pat & leave and they would go right to sleep. Unless there is some sort of illness or something really unusual, my kids rarely wake in the middle of the night. I'm the best rested mom of kids 2, 4 & 6 I know. Good luck! Let me know if I can help!
One more thing...two of my kids wanted nothing to do with a pacifier. I would just let them suck on my thumb, pad side up for a few minutes to help them soothe, but would not allow them to fall asleep that way - or I would be having to be available to them all night long :)