My 6 month old baby has been crying in his sleep nearly every hour throughout the night for nearly 2 and a half months. Sometimes the bottle, dummy and rocking will stop him. But other times he just cries and cries until he wakes himself up. When he wakes he's laughing and talking so I know he's not in any pain. I asked the nurse at his vaccines what she thinks it is but she honestly didn't know and said for me to make an appointment with his doctor but that he's thriving and doesn't seem to be anything wrong with him. Anyone else have/had a similar problem?