A strange noise spooks the narrator

My eyes were wandering around the page of my book as I was sitting in the fort I made. The moon was strangling the sun and winning for the next eight hours until he was finally defeated at dawn. A frightening sound whispered through the window. Horrified as a person could be, I abruptly hid under the covers. The time went by and I didn’t notice a thing, so I quietly read so I could hear if anything came close. As I heard something come close, tears rolled down my face and dripped on the page, slowly washing away the words. “Man, that was my library book!” I exclaimed, quickly covering my mouth just in case. Slow as a sloth, I unfolded my covers, accidentally leaving my bravery behind. I got closer and closer to finding out what was making that noise. The covers were finally letting me see what was around my room. My eyes scanned the room: nothing was there. “I guess it was just the wind,” I mumbled to myself as the wind whistled, and I went to sleep.