*reminder: "I" in this story is not me, Saya!
This is my friend's experience.
When he first entered university and started living on his own he began to experience sleep paralysis frequently. At the same time he began to get many wrong phone calls. For example he received a lot of messages from a strange old woman on his answering machine, and once he even got a message from one stranger saying, 'your father is dead,' and that nearly gave him a heart attack (his father of course was alive).
One day he was dozing on his bed when he saw someone running on his balcony. Without thinking he shouted, 'Hey!You!'
And it seemed this annoyed the person on the balcony and he came into my friend's bedroom.
At first my friend thought the man was alone and he thought he would just kick him out, but the man wasn't the only one on the balcony. There were other people and they kept coming in until there were around five or six people who stood surrounding his bed.
And my friend became paralysed, seemingly from fear. He couldn't do anything with his paralysed body and he just kept saying to them in his mind, 'I'm sorry, I'm sorry,' over and over.
That seemed to have worked and the people left his room.
After they were gone my friend fearfully went out on the balcony to look. His house is on the fifth floor and his balcony and his neighbours' balconies on both sides were separated by walls. The walls were special ones that were breakable in case of emergency, but they weren't broken and no one could possibly have passed through the balcony.
My friend thought it all had been a dream.
And then days had passed since and he no longer remembered about the dream. One night he was drinking with his friend in his room and they were talking and enjoying themselves when his friend suddenly shouted, 'hey, you there!' and tried to go out on the balcony.
He asked the friend, 'what's wrong?' The friend told him that just now he saw some men running on the balcony.
It was then that my friend remembered that he had had exactly the same experience before and that he had never told about it to anyone.