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17. Tune Into White Noise
Sometimes distracting noises are enough to either keep us awake or rouse us out of a deep slumber. If that's the case, a white noise machine might be the answer. The soft hum will mask any surrounding sounds. The Marpac Dohm Classic is a popular option, and at $47, it's relatively cheap. 

If you want to go more upscale, try Bose noise-masking sleepbuds ($249). They pop into your ears like headphones, but they're pre-loaded with soothing sounds to relax you.