My kid sleeps with some kind of white/brown noise since being around 2 years old. The child psychologist we went to with, now, the 6 year old recommended us to try to eliminate the noise. She seems to need it to fall asleep, but around midnight it should be easier, but we still have ups and downs with it. The psychologist said that it is a kind of a strain for the nervous system as it is kept being stimulated (at least that's how I understood and tried to translate it to English).
