In my childhood I saw a very strange hallucination that I remembered very well. This is the only time in my life when I saw hallucinations (I think that it was my brain that was playing games with me, you shouldn't believe everything your eyes see). Perhaps it might be interesting - I understood where all these stories came from in different cultures.
The following happened: I was 5 or 6 years old, in the evening I went to sleep in my room like usual, I heard my parents watching TV in the next room, lay for 20-30 minutes and couldn't sleep. The room was dark but not completely, at a distance of about 2 meters one could see quite a lot. I definitely didn't sleep, started to get out of bed and felt something strange, incomprehensible feeling and noticed some silhouette in the opposite end of the room. I thought that my mother came into the room and was going to ask what she wanted, was going to open my mouth and froze when I saw that this "I didn't know what" had 2 big horns on his head, this creature slowly came closer to my bed and I saw his head better and I realized that this is definitely not a human. I didn't know what to do, but I was not scared - i was shocked, I didn't expect to see something like that and stood still not knowing what to do and how to react to it. It certainly wasn't some kind of monster or animal, it wasn't scary at all - despite the large upward and backward horns on the head and the fact that it wasn't exactly human, this creature looked beautiful, I probably never saw anyone more beautiful. I kind of felt that this is something very clever and certainly from the "good guys", that I have nothing to fear at all. His head was very similar to how dragons are usually depicted and his horns were like those of a dragon, but his face were very graceful and it had very beautiful eyes. The body had long clothes and some kind of metal equipment and electronic devices - the body itself was hard to see. The clothes were black and from some strange ribbed fabric, like a mixture of fabric and metal, it was very elastic and followed the movements of the body. It was obvious that this creature is not only reasonable - it is much smarter than humans, uses some very advanced technology, there was something magnificent in it, a strange sensation. It just stood and looked at me, I don't know exactly how much time, I didn't notice because I was in shock, my thoughts were "what the hell am I supposed to do?". Then it just disappeared - it is there and after a split second it does not. I jumped out of bed and ran into the room to my parents, I was shaking, I felt very strange, I do not know how to describe it.
It was very similar to what is called "Succubus", and it looked or seemed very beautiful. This is not at all what is said in religions in any case, it is not some demons, evil creatures or stupid monsters (even if it were real) - they use advanced technology and some unusual electronics.