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Though everyone knows that they they should sleep 7 ~ 9 hours is good for health, few people will honestly sleep at least 7 hours. In fact, good sleep not only brings benefits to your health but also makes you more beautiful -- this means that if you don't get enough sleep, you may become "uglier".
Sleeping in a peaceful environment is not an easy thing for everyone. We'll encounter various noises from neighbors, sites, or passing vehicles. Sometimes we couldn't even sleep in our bedrooms —— due to work or trips, we have to spend the night in our car and the outside noise keeps disturbing us.