My experience with spirits (take it as you will). Sorry for the length.
Before moving in with my sister, she already told me stories of the ghost she had. She said she would hear it breathing in the corner of the room, doors would open, lights turn on/off etc. My elder brother was staying with her for a while and things got worse. The ghost would breathe into his ear, locked him out and even grab his leg. When he eventually parted ways with my sister, that night she said she heard it run around the house, run into her room and it jumped onto her bed and started breathing again in the corner.
The ghost was dormant after my sister came back from holidays and she never heard from him in a long while. It wasn't until 3 weeks after I moved in, that she started to hear him breathe again and walk past her door sighing. But, it wasn't until a week later when the ghost gave me a formal introduction...
I was heading to bed around 11:30pm, half an hour after my sister, and as soon as I entered my room, I just felt this uneasy presence. My cat zips straight into my room, onto my bedside drawers and sits still upright completely focused on the blinds. I turn the lights off I try to go to sleep. The blinds then started violently slamming against the window at a very consistent and unnatural pace, that a simple light breeze does not do. It stops. I try to sleep; it goes again, and again. I get up and close the window, and notice my cat is still fixated at the blinds. I fall asleep.
I wake up from an unrelated dream at 4:05am (the hour in which the ghost is the most active). Suddenly, a light goes on from my sister's room. It stays on for about 3 minutes then turns off again. At around 4:15, my sister wakes up, turns her light on and goes to the loungeroom, because she heard the blinds for the balcony banging, but the door was closed. And I never heard the loud banging.
She gets back to her room turns her light off and gets into bed. The ghost starts to breathe heavily towards her. She can hear it, and I could hear it coming from her room too.
At around 4:35, I could still hear the breathing, but the breathing changed, the "hee hoo" kind of breathing slowly turned into an ambient laugh that echoed and moved around towards me. I admit now I was a bit freaked out. Then it was quiet. The cat meows and then the ghost was running around the house, the sounds of his footsteps can easily be heard, tapping the table, touching the front door's knob, etc.
In the morning, my sister and I were talking about what had unfolded. She never heard the loud banging in my room, and she was still awake when I went to bed and I never heard the loud banging she heard. She only turned the lights on once, she wasn't awake when it went on the first time.
We were talking to our upstairs neighbours about it, and they say they heard him running up the stairs and touching their front door handle at around 4:45 and raced into their bathroom, closing the door behind him.
We got an appointment with a "ghostbuster" but that was 2 weeks away. The closer to the day the ghostbuster comes, the more active the ghost was. She warned us when we make the appointment, the ghost would get upset.
During the day around midday, I was walking down the hall and I heard ruffling in the hallway cupboard, I looked in and of course nothing was in there. It wasn't until my sister came home from work when she told me she heard the ghost the night before opening that door wide open and closing it multiple times, as well as opening and closing some kitchen cupboards at the same time.
Since the ghost is attached to my sister, it has been known to be with her outside of the house. But it was the first time that it was clearly obvious he was there. She was getting a spa treatment and she was left in the room alone. The door opened and the ghost went around the table she was on, shook it a bit and then left the room...
One night I went to bed at around 1:30am and as soon as I turned the light off and went in the bed, he started to breathe heavily. It wasn't long after that, when the bathroom taps blasted on. They were on for 5 seconds, then turned off, then again, it blasts on and off again. I get up and head towards the bathroom and then it stops. I tell it to leave us alone and head back to my room. I then hear it leave the bathroom and clear it's throat. Then it casually walked around the house and then back to my door. Then the breathing started again...
The ghost has spoken to my sister once before, after she told he to go away multiple times one night and he replied with an "Okaaaay". But, it is clear he doesn't like me.
Another night, I went to bed with him breathing in the corner as per usual, but not as loud as he usually is. I fall asleep. I wake up three times during the night, all three times I have sleep paralysis; couldn't move anything, not a muscle on my face. On the third time, I wake up and mumble something like "let me go", and the ghost replies (someone spoke) with "only if you scream loud enough". Now if that wasn't enough, with the little opening in the mouth, I start screaming. Only thing is... I wasn't controlling my scream. It was done involuntarily. It wasn't that loud as I couldn't move anything. The whole time I was screaming, I was thinking 'What. The. Fuck'.
I am now relieved of the paralysis and then I move to the left side of my bed. The ghost is now breathing on the right side of my bed where I was at. I tell it to go away and let me sleep. It stopped for a while then started again. I turned around and faced the right hand side while I tried to get to sleep. It then stopped...
My sister wasn't getting harassed that week, but she was feeling extremely drained, and conks out into deep sleep.
My sister's friend, who is a hypnotherapist, came and slept over one night, on the sole purpose of meditating in my sister's room. It was around 3am when the breathing started again, so he got a chair and sat in the left hand corner of the room (where it breathes the most (it's the right corner for me over the wall)) and he started to go into deep meditation. He said could hear the sickly breathing coming from my room. He also heard him walk past the room a few times, but the ghost never entered my sister's room with him in it. He was asking if the ghost would leave etc. After a while, he felt a tingling chill go down from his head. This went on for 2 minutes, then the air was silent... In the morning, he said the ghost is gone, but my sister and I still felt he was around.
Two days later, I was on my own, during late afternoon, and my bedroom door handle started to shake and rattle furiously. That same day, I was in lounge room at 8:30pm and the tall lamp on the other side of the room that I had on, started to dim and flicker. Nothing strange, it happens to everyone, but 5 minutes later, I heard two deep breathes come from there and my cat immediately runs outside on the balcony. 10 minutes later, a strange, metallic, whiny sound was coming from outside, I walk outside and the sound was coming from outside my sister's room. I walk back in and my cat is still outside sitting upright meowing at the wall where the sound was coming from.
That week, I started to feel extremely drained just like my sister has been, for no reason at all, so we were both conking out.
I did try to get recordings of the events during the nights. But no matter what I used to record it (phone, camera) mosts nights it would stop at 29:50. There's no sleep function or anything.
So finally, the ghosterbuster came, she knew nothing of the events in the house, other-than that it was haunted. She picked up on the breathing, she even picked up on what kind of breathing it was. She said it was a man who had a lot of chemicals in him and that made him breathe like he did.
I'm usually not very serious about the 'mumbo jumbo' kind of healing, but she's travelled across Australia with her job. Our bedrooms were the main forces here, especially my sister's, and so she she did her thing and got rid of the ghost. She sat us down and cleansed/healed us. I admit, I did feel a little light headed when she was doing this to me. Then she did the whole house.
Now when I entered my own or my sister's room, the air isn't as dense, or heavy, or stuffy. I can't explain how lighter the air felt. There was always a different feeling when you enter the rooms, but now there is nothing blocking it.
3 weeks later after no sign of any activity, I wake up at 3am and I could hear breathing in the corner of the room as per usual. My back was towards it. Suddenly I feel it jump onto my bed, and this time it actually pinned me down and I was struggling to kick it off (not sleep paralysis this time). I felt this uneasy presence and see a shadowy figure going over me. It was accompanied but a low, deep growl sound which I can't explain. It eventually subsided and his breathing was back to the corner.
Minutes later I hear my sister as she shuffles and turns on her bed, clearing her throat as well. I didn't know if she was awake and could hear him.
Next morning I get up and my sister is not home. Turns out she left for her boyfriend at around 1:30am, she heard the breathing as well, but chose to ignore it. So it wasn't her on her bed... That was the last we had anything at our place.
But this isn't the last of my story. I'm doing a play and we go rehearse in the theatre. We were in the 'movement room', sitting around the table about to start going over our lines. It was a dark and cold morning that day, so the lights were on. 5 of us are sitting around the table about to start, and one of the light starts to flicker... a fitness ball underneath starts to bounce, it bounces a few times, rolls out and then rolls back in. We were sitting there amazed. Turns out the block is supposed to be haunted. We told someone in our group (not in the room at the time) about it and she said a month or so before she saw a blonde girl sitting in that room in the reflection of the window.