My son is waking every night between 3 and 5am and will only go back to sleep if the hairdryer is switched on. Needless to say I am worried about his ears and having a hairdryer running for hours on end. We bought a white noise CD but when it ends after an hour (even if on repeat) he wakes and the crying starts all over again. Anyone have any (long) recordings of white noise I could pinch or anyone have a white noise machine they can recommend. He's 18 weeks this week.