Toddler sees ghost

My 3 year old came into my room at 3am and said mom a white ghost came out of my closet and he was so serious. He wasn't crying he just seemed extra alert for the middle of the night. This is only the 2nd time total hes bothered getting out of his crib. His big boy bed is assembled we just didn't do the transition yet. Doing that soon. He sees alot of Halloween stuff on his tablet which i have been blocking little by little. He took me in his closet and pointed to the white ball on top of his baby hat saying see see white trying to make some association. Is this tablet stuff or something spiritual do you think? He seems to love scary stuff but he at night seemed scared.