This story happened directly to me, but as I was a toddler I don't remember it, just the consequences. With that said, this is what my mother and grandmother told me.
When I was 3 years old, I started to cry a lot at night. The only way I would sleep was in my mom's arms and she had to be walking, if she stopped to rest, to sit, to try to sleep, I would wake up and start crying. This went on for a couple of months, my mom was exhausted, drinking coffee like crazy, so one day she told my grandmother what was going on. She told her to take me to a priest but she refused so my grandmother took me instead. She says the moment I stepped into the priest's office he looked at me with a worried look on his face and said I had a dark energy surrounding me. As a "treatment" he started reading passages from the bible.
He sent me home for the day and said I should visit him from now on to continue the readings. I don't know how much time passed until I went there again, but this time things went differently. I got there, he sat me in front of him and started to read. Granny says I started to act out a bit, nothing serious, but I wasn't behaving normally. Things escalated and next thing she knows I was getting up and slapping the bible out of the priest's hands. He refused to see me again in fear things would get worse.
Since then I can't sleep alone and without a light on. In fact, during my life I went through phases, first I would sleep with the lights on, door closed, tv on and with sound and of course with my mother. Then I would turn off the sound of the tv, then the lights, then one day I started sleeping with only the lights on and now, at 21, I sleep with the hallway light on and with the door open, alone. I'm still terrified of the dark.
My mom has told me some creepy episodes from when I was little, like waking up in the middle of the night, sitting on my bed and starting shaking and eyes and mouth wide open, being afraid of my bedroom, hearing things at night. I once saw a lady in a white dress there, my sister saw a hooded black figure, she swears it had red eyes, going up the street at midnight. I am now living in the house above my childhood home and so far so good, I feel watched sometimes but that's about it.
Please feel free to share your thoughts on what happened when I was 3, because I really don't know.