I used to have a lot of difficulty falling asleep. ( Or you can say "Falling asleep used to be very difficult for me" ). In the past, I often woke up at about 3:00 a.m. and that was a very annoying thing for me. Since I started running at night, my sleep has improved a lot. I think exercise may be a good way to improve sleep quality. It can help you fall sleep more quickly and help adjust your body clock. Also, early to bed and early to rise is important for our sleep quality.