This is actually my fathers story and when he told it to me there was no lie in his eyes.
My father was travelling through Europe and was staying with a friend as he needed to rest and was gettting tired of youth hostels. It was an old house which my dad describes as an 'old mansion', which by all means it was. It was in a forest on the bank of the Isar river. He unpacked in his room, which was in the atick and went to bed. In the middle of the night we woke, unable to breathe. His bed was beside the light switch so he reached for it and flicked it on.
Instantly, he was able to breathe. there was nothing there.