sleeping womanFlickr/Courtney Carmody
When you go to sleep tonight, put a book under your pillow. When you wake up tomorrow morning, you'll have its contents memorized.
OK, so that probably won't work.
But don't lose hope just yet: It turns out there actually are a few things you can learn — or at least improve your grasp of — while you snooze. Most of them depend on one thing: sound.
Here are some of the skills you may be able to sharpen in your sleep:

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