fervus writes: Hi! I live in a crowded area, next to a hospital and the sound from the street below makes for a poor sleep — with engine noise from busses, trams, motorbikes and sirens from ambulances. My exterior walls are coated with sound-proof materials and I have tripple windows but somehow the nights are still very noisy. I've read about white noise for blocking sound. Can you recommend any solutions you've tried? How should a white noise be mounted for best efficiency?