I remember in a children's camp, in the 90s, one boy in the middle of the night jumped up with screams, pressed his hand to the wall with all his body and kissed her. We were all scared not to joke. Then he slept quietly. In the morning, I asked him what happened. He told him that he laid off his hand and did not feel it, and when he turned over, it was under him and he thought that there was something cold, strange, extended shape in the bed and joked not for a joke, jumped out of the bed, and she was behind him, he thought that some sort of creature like a worm and let her lump. Only after 5-6 strikes realized what it was about.