Heres a experience I had from the hospital... this was 4 years ago.
Well my oldest sister was in the hospital for a month getting chemo to see if she can get better from her cancer. It was a 30/70% chance of it working but we took our chances. Since I was not doing anything because it was school summer break, I had to stay there with her.
On the first night my sister kept telling me to tell that man to go away. I was like what man, I don't see any man maybe it was the morphine making her hallucinate. Thats what I wanted to believe but afterwards a few hours into the night it was around 11pm, I heard knockings like a nurse wanted to come in. I said come in the door open and no one was there. I thought the nurse was playing a joke and I went around to the nurse station and asked her did she knock on the door and she said no. I went back to room and I can see my sis eyes fixated on a chair next to her bed. Being scare and dumb, I decided to move it so that she would stop looking at it. Well I stayed up as long as I can watching tv, till my eyes got really tired and fell asleep. When I fell a sleep on the cough recliner, I felt something try to come and sit on top of me but fought it off by dreaming about me being goku from dbz turning super saiyan and forcing it off. Well before the heaviness was gone, it said it'll be back for me again in a clear distinct old grumpy voice. I woke up scare as hell and it was only 3 in the morning and my sister was looking at me. I couldn't sleep no more and stayed up till in the morning when the sun came out, I fell fast asleep.
It was about to be the second night being there but I told my parents what happen and they blame me for being lazy and not wanting to stay with my sister. So I was forced to stay another night there. This time I told my nephew to stay the night there with me, he fell a sleep around 10pm. I stayed up because I had that gut feeling something bad was going to happen. It was getting close to 1 or 2 in the morning because thats when they do naruto on adult swim. While sitting there, I can see the chair sliding towards her bed and the curtain around her bed slowly opening. My heart was racing and felt like it was about to explode so I woke up my nephew and he saw it too. The curtains opened and no one was there but she was talking to something laughing and smiling. I had just bought a cell phone and my nephew told me to record it so we can show our parents. As soon as we started to record it the lights started to licker a little bit and you can hear little girls laughter. Then the water bottles and cups would just tip over for no reasons, the tv turns on and off. I got tired of this and told whatever it was that I know someone, who can communicate with you and remove you, if you don't leave right now. After I said this the temperature drops and was freezing cold. I tried to remain calm so my nephew don't freak out and all of suddenly it disappears and everything back to normal. We showed my parents the short clip and they had her move to a different room, and the adults stayed the overnight. I was told by my older brother that it had frequently happen until she passed a away two weeks after the first incident.
After all of this we had to call in a shaman to check me out just in chase, and he told my dad that I was very lucky because if i had stayed another night there it would had come taken my spirit. He told me that by challenging it, it went to get more spirits but when it came back I went home. It followed me home but couldn't get in because we have the one thing to protect the house with. So he went back and waited there in my sister hospital room but didn't disturb my family because he only wanted me. The shaman guy had to burn money and incense so that it can go away. Hospital still freaks me out......