Of sleep. My son used to sleep through the night, but recently he's been up EVERY hour and a half and the only way to calm him is to stick the boob in his mouth. I don't know where this has come from, and I would suspect more growth spurt symptoms, however, during the day, he is absolutely fine. Also, we moved last week and he has not slept well since then. What have you other mommas done in this situation?