Exercise helps with sleep and it improves the overall health of your body and also helps manage stress. Incorporating aerobic activities, such as jogging or biking, a few times a week can help you fall asleep faster.  Timing is important when it comes to exercises effect on sleep. Exercising too late in the day can result in an increase in energy, leading to difficulty falling or staying asleep. Aim to exercise in the morning or late afternoon. Nicotine and caffeine are both stimulants that say in your system for a long time. Smoking or drinking coffee too late in the day can result in trouble sleeping. Try to avoid coffee past early afternoon and if you smoke, make an effort to quit. Tobacco can have other negative health effects in addition to trouble sleeping. While alcohol can cause you to feel sleepy, the sleep you have when intoxicated is of less high a quality. Aim to avoid drinking more than one or two drinks a night if you want better quality sleep. Alcohol also interrupts REM sleep. . If you have a lot of stress in your life, this can keep you up at night. Make efforts to reduce your overall stress level if you want better quality sleep.  Start with basics. Make an effort to be more organized. Small changes, stuff like just keeping your environment neater, can have a dramatic impact on stress.  Take breaks. Do not push yourself to work too hard throughout the day. When you need a minute, take 10 or 15 to unwind.  Look into stress-reducing activities. Things like yoga, meditation, and deep breathing exercises can have a dramatic effect on your stress levels. If you often have trouble sleeping even after making certain changes, contact your doctor. Difficulty sleeping can point to a variety of underlying health concerns. A medical evaluation is necessary to rule out any serious health problems. Your doctor may be able to prescribe you medication to treat sleep disorders.

TL;DR in Vietnamese:
Tập thể dục. Giảm lượng nicotine, đồ uống chứa cồn và cafein. Kiểm soát căng thẳng Biết khi nào thì nên đến gặp bác sĩ.