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Hypnopompic hallucinations are often discussed along with hypnogogic hallucinations. Both of these have to do with hallucinations occurring as people enter or exit sleep. When people are just on the edge of sleep they might experience hypnogogic hallucinations. If a person is about to wake, he or she could have a hypnopompic hallucination.
What makes hypnogogic and hypnopompic hallucinations different from dreams is that they tend to lack a story. Moreover the hallucinations may vary. People could experience a physical feeling, a smell, a sound, or quite frequently an image or sight.
The image could be a simple line, dot, pattern, or it could be a full person, animal or other. It is important to add that whatever experienced, the perception of something not there can feel very real. Hypnopompic hallucinations might make people bolt out of bed, and then feel very disoriented, or they sometimes create the sensation that the person is paralyzed and cannot move.
Hypnogogic and hypnopompic hallucinations are characterized by their “realness.” They also have a tendency to disrupt sleep. While they might suggest a person has sleep disorder, the hallucinations do not have much to say about the sanity of the person having them.