so they don't hear so much of a swoosh as much as they hear a rrmm, rmm nk, more low pitch.you think about calming a baby, when they're crying, you go, shhh, but as they calm, you go shh, you naturally lower your voice. >> that's interesting. you're absolutely right. i have three young children, as you may know, and you just described that perfectly. but my children are about to be 7, 5 and 3. your new book also helps older children get to sleep. my youngest child is having the most difficulty. what do you tell a child when they become a toddler who doesn't like to go to bed? >> well, for one thing, you're not alone, i'll tell you that. baby center and i just did a survey of over 1,000 moms and we found a third of the families were struggling with their kids' sleep over a year of age with defiance at bedtime, like you're saying, or waking up in the middle of the night. and so, of course, you can use white noise for those kids as well. that helps them not wake up or not bother you in the middle of the night. they'll sleep through better. but i like to start bedtime, believe i