Ambient sounds such as white noise are often helpful for blocking out louder, sharper sounds by "masking" those noises with a gentle, tolerable sound. That's because white noise delivers a uniform amount of sound at every audible frequency.  White noise reduces the difference between typical background sound and sudden noises, like a door slamming or a car honking, that could potentially interrupt sleep.  You can buy a specialty white noise machine, download white noise tracks online, or simply keep a fan blowing in your room while you sleep. If you don't have a white noise machine or fan handy, you can try using household items to distract you and drown out undesirable noise. A television or radio can help block outside sounds, but researchers caution that leaving a TV or radio on all night could disrupt your natural sleep patterns. For best results, researchers recommend using a timer to ensure that the radio or television will automatically turn off at a certain time. Earplugs are an effective way to help block outside noises while you sleep. They're even more effective if you combine earplugs with white noise in your room. You can buy earplugs at many pharmacies, or online. Earplugs may take some getting used to and be uncomfortable at first.   Always wash your hands before putting in ear plugs to minimize the risk of infection.  To remove, twist the earplug while slowly pulling outwards.  If an ear plug doesn't seem like a good fit, don't force it. Every brand shapes their product differently, and you may simply have to try a different brand.  Familiarize yourself with the risks of earplugs before you use them. Removing them too quickly or pushing them in too far can lead to a ruptured eardrum. They can also introduce bacteria into the ear canal, which could cause an infection. In addition, the earplug may muffle important sounds, such as your alarm to wake up, a smoke alarm, or the sound of someone breaking in.

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Write a summary of the previous text in Vietnamese:
Sử dụng tiếng ồn trắng. Mở nhạc hay phim để gây xao nhãng. Đeo nút tai.