L.B.
http://www.growingyourbaby.com/2010/04/23/study-cry-it-ou...
http://www.phdinparenting.com/2008/08/11/cry-it-out-cio-i...
You should not let your baby cry it out. This is terrible advice. It is harmful to baby and really, you are losing more sleep while baby cries that you gain from "training" your baby. We are sleep sharing, and have no problems at all. Sometimes during teething he is more restless and wakeful, but I am glad to be there with him when he is going through rough times. I feel that's our job as mothers. Please read about attachment parenting, everyone that posted. It feels wrong to let your baby cry, well, because it IS wrong. I promise you, these wakeful stages pass regardless of your response or lack there of, so be there for your baby, don't try to train him or her like and animal.