
After having my first child I experienced postpartum depression. A lot of my sadness was a result of countless sleepless nights. I could not function, I didn't feel like myself, and most importantly I was unable to be the best to my most prized gift. Many moms experience this unless they sleep train. Something that I did not do. 
Though I did not sleep train, my first child, I do plan to with my second as I have been informed by all of my mom friends that did try the Ferber method that they were much happier, their baby slept better and was much happier. And it doesn't get any better than a happy mommy, because a happy mommy brings a happy baby.
Though this method seems harsh the results outweigh a couple nights of crying. 
For those of you unaware of the Ferber method, it is basically allowing your baby to cry it out for a couple of night until they get the idea that they can sleep alone. 
I think this research is beneficial to those parents and families that can stand a few days of crying.