I feel horrible. What if I dare not sleep?

Then as long as there are superstitious things to help you, you are not afraid.

Go find a peach tree and take a branch with leaves from the tree (oh, not picking).

Then take it back and hang it on the dagger. Then hang these two things behind the door of your room, and the ghost will not dare to come.

I heard it from a fortune teller. Believe it or not, I don't believe in ghosts, hehe.

Said it was just to give you some sense of security,

The most fundamental thing is yourself, don't believe that.