Which sleep sound are the best for falling asleep? How about staying asleep? And is the future of sleep simply a story without an ending?

Add Yahoo as a preferred source to see more of our stories on Google. Cole Kan/CNET If you're a light sleeper who's sensitive to sound, then you know how difficult it can be to catch some Zs.

You crave a good night's sleep after a long day — but your noisy neighbors, snoring partner, or early rising roommate make reaching deep sleep feel like running a marathon. White noise or calming ...