The previous house I lived in was haunted but I didn’t know until we moved, my mom was smart and didn’t tell me otherwise I never would’ve been able to sleep. Little things like coming home and all the lights will be on (we know the people who currently live there and stuff still goes on, the lights too) even though you check them a hundred times. We had to put rugs in the hallway that went down to my room because my mom would hear footsteps in the hall, think it was me and then check on me in my room and I’d be sleeping. We had both also felt someone sitting on our feet/the end of our beds while in bed. So yes, I believe in ghosts.