The presence of various entities next to the bed in the room or outside the window. The entity appeared after a sudden awakening. After a while, it disappeared / melted / dissipated.
Sleep hallucinations are events imagined by a person that appear to be very realistic. Most of the hallucinations associated with sleep are visual, but there are also auditory, tactile, gustatory, and even olfactory hallucinations. There are also hallucinations associated with the sensation of movement.
If the hallucination is observed before going to bed, then it is called hypnapomic, and if upon awakening, then hypnapomic. But in the specialized literature, the general term "hypnagogic hallucinations" is often used.
Complex visual hallucinations in the form of motionless images of people or animals. These hallucinations usually occur after a sudden awakening from sleep. A person knows for sure that at the moment he is in a state of wakefulness. At the first moment, he may be frightened, thinking that these creatures are actually present in the room. And in fear, he can jump out of bed and even get injured. Perceived images may be distorted or unusual in size. They can be stored in the imagination for several minutes. After turning on the lights in the room, hallucinations usually disappear. Such episodes rarely occur. In some cases, they can be associated with migraine-type headache attacks. In this case, the headache quickly disappears after the disappearance of the hallucination.
Phenomena with which eyewitnesses associate the appearing images: ghosts, supernatural beings, aliens.
Children are most susceptible to such visions, especially in the first years of life. With age, the number of such visions decreases, but it is believed that every person in his life has experienced such visions at least once.
In addition to age, there are a number of factors that increase the chance of experiencing such visions: stress, insomnia, naps, etc.