I second @MikeB. I've been using this for years and feel lost without it. The fact it's mechanical makes all of the difference in the world. I take it when traveling, but when I've forgotten on occasion the Sleep Machine app for iOS has a really good "Air Conditioner (Hotel)" sound that, like the name suggests, sounds like a noisy AC, haha.I've been using this since 2006. I've taken it on some of my travels too.
Sounds like a fan that you can tweak the tone and speed a little. (It actually is just a fan in a case)
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Yogasleep Dohm Classic (Tan) The Original White Noise Machine, Soothing Natural Sound from a Real Fan, Noise Cancelling for Office Privacy, Travel & Meditation, Sleep Therapy For Adults & Baby
I usually pick up my pillow, fluff it about a bit, poise it right above her face, and think...."Maybe next time."Do any of you have opinions on devices to improve sleep quality that you care to share?