I used to have short hair. My friends always ask me curiously why my hair always looks so straight and beautiful. Well, the best way is to keep a good posture while sleeping and touch it smoothly from time to time-but this method is really painful, and even later I got into the habit of touching my hair unconsciously while sleeping. You can also wash your hair in the morning, so it won't be messy. As for straightening-if you have short hair, straighten your hair. If you don't sleep honestly, your hair will be messy the next day. Try it if you don't believe me. Hey hey.