In fact, losing weight depends on self-control and persistence, as does changing any habit. I suggest you make a list of the dangers of staying up late and read it before chatting and watching movies. The biggest harm of staying up late is to accelerate aging, and the effect will appear when you are about twenty-three or four years old. Just try it. In addition, you can make a plan to chat and watch movies, who to chat with every day, how long to chat, what movies to watch and how much to watch. Make a plan and turn off the computer decisively after reading it. Don't leave room for yourself, or you will be finished again.