Our 2 DDs (4 1/2 years, and 6 months) share a bedroom. As of recently, DD2 is doing well sleeping in her crib for the first part of the night (until now she's been in our bed 100% of the time), and that's working well for all of us. However, loud white noise seems to be part of the key for her.
Our question is, is it bad for our 4 1/2 year old to sleep a good part of her night with white noise blasting? Has there been any research on the effects of white noise on older children's brains, long-term effects on becoming a light vs. deep sleeper, etc?