Do you think it is real or in her mind?

Can humans have with an incubus spirit. And if so how is it and how often do humans have with it. And do they come when they want and when you want them to? And can they speak to you as well. Just curious. The reason I asked this entire question is because a friend of mine did not feel well one day - her stomach hurt and she decided to pull down her pants and underwear and lye on her stomach on her bed. Then about fifteen minutes later she swore she felt a go inside of her. She was home alone. And also she said that one night she felt something jump on her bed and tell her not to move. Do you think they really exist or is it our subconscious playing tricks on us.