We are considering buying an apartment. Most apartments have the kid's bedroom separated from the living room by only a thin wall.

We are concerned about implications, in particular noise due to people talking or watching a movies past the child's bedtime. We do not have a child yet, so this question concerns potentially all ages from age 0 on.

 - Do children get used to low-volume noise while trying to fall asleep and/or while sleeping?
 - Under the assumption that they get used to it, would it significantly influence the quality of their sleep?