I am a grade 5 teacher and had both my girls in the summer, so they grew and went through the third trimester as school was coming to a close. Trust me, you don't know noise until you have been in a classroom of 24 11-year olds in May and June!! I have had no issues with my girls' hearing or sleep ability. In fact, they share a room and are both able to sleep through the other's crying most of the time! I attribute my two-year old's excellent speaking and vocal abilities to hearing so much speech while in the womb, from me and the kids. Don't worry, it will be fine!! Good luck!