did they grow out of needing the help? my 11 week old DD is addicted to the hairdryer. it's the only thing that calms her down when she's really upset/ over-tired or gets her to sleep when she's fussy. firstly i'm worried that the hairdryer is going to break (which would be a disaster) but i'm also worried that she's never going to be able to get herself to sleep without it... did your kids stop needing the white noise, and at what age?