A hypnopompic hallucination is just the opposite of a hypnagogic hallucination. That is to say, it occurs when a person is coming out of sleep. Like a hypnagogic hallucination, this hallucination can include hearing, seeing, or sensing things that do not exist.
Also, like a hypnagogic hallucination, a hypnopompic hallucination is generally not a cause for concern. Healthy people can have hypnopompic hallucinations without underlying medical or psychological problems.