Cry Me a River

Yesterday when I was at the Dr, I told him about Reese not sleeping through the night. He asked me if I liked getting up with her in the night...haha! So he suggested this : let her cry herself back to sleep. I'm not an idiot I thought, we all know we should do this. I have hesitated because Mason and her share a room and I DO NOT want him awake in the middle of the night. He said the first night will be bad and she will cry for a while, the second night she will cry a little less and by the third night she will sleep through the night. I'm totally skeptical of this because it sounds to good to be true. So I tried it last night. Mason had already crawled himself into our bed by the time she woke up, so I let him stay there until she fell back asleep. She cried/screamed/played from 1:55-2:40 . I hate hearing my babies scream. I know they are fine, it's just hard to hear. Then it was silent. It is currently 8:06 am and she is still asleep. That is 12 hours with a 45 minute crying episode in between. It was the best night sleep I have had since she quit sleeping through the night at 5 months. Needless to say I am extremly full (nursing), but thrilled as well. Could this really work?