Article in English: Your body's circadian rhythms seem to be very sensitive to the blue light given off by electronic devices like TVs, cell phones, and tablets. Using these devices before bed can interfere with the release of melatonin, the body's sleep hormone. Turn electronics off at least an hour before bed. The food and drink you consume throughout a day can have a dramatic effect on the quality and quantity of sleep you receive. Follow these strategies:  Eat 2 to 3 balanced meals containing fruits, veggies, lean protein, whole grains, and low-fat dairy. Eat your last meal at least 2 to 3 hours before bed. Avoid late-night snacking or drinking which can interrupt sleep for bathroom runs. Know that smoking cigarettes can be detrimental to healthy sleep. Avoid caffeine and alcohol for up to 4 hours before bed. When receive the nationally recommended amount of 150 minutes of vigorous physical activity each week you tend to sleep better for it. Regular exercise not only improves physical health but can also give you energy to eliminate daytime sleepiness and enhance concentration. Be sure to engage in at least 30 minutes of vigorous exercise each day. This can include walking, hiking, swimming, dancing, or biking. Worry can be a primary factor keeping you up at night. To prevent worrying from affecting your sleep, create a worry period in the late afternoon or early evening.  A worry period allows you to postpone worries until a given time so that you can adequately enjoy your day. Choose a short period - about 20 to 30 minutes. If a worry crosses your mind prior to your worry period, merely write it down and tell yourself you will attend to it later. During your worry period, go over all the worries you have collected during the day. Aim to problem-solve each one so that it does not continue to haunt you. Sleeping in or staying up late on some days can wreak havoc on your circadian rhythms. Keep regular hours by going to sleep and waking each day around the same time.

Summary in Chinese:
关闭电子设备。 注意饮食。 多多运动，建议每周进行150分钟左右的有氧运动，这样能让你睡得更好。 把忧虑时间提前。 每天坚持遵循固定睡眠时间。