Hypnogogic hallucinations occur during sleep paralysis and feel very, very real.
From the psychcentral.com
At the entrance were a number of poppies and other hypnogogic plants.
From the en.wikipedia.org
The result is that you are suffering from regular bouts of sleep paralysis and hypnogogic hallucinations.
From the psychcentral.com
Effects of sleep paralysis include heaviness or inability to move the muscles, rushing or pulsating noises, and brief hypnogogic or hypnopompic imagery.
From the en.wikipedia.org
More examples
Soporific: sleep inducing
Hypnagogia is the experience of the transitional state from wakefulness to sleep: the hypnagogic state of consciousness, during the onset of sleep. In contradistinction, hypnopompia denotes the onset of wakefulness. The related words from the Greek are agu014Dgos "leading", "inducing", pompe "act of sending", and hypnos "sleep".
The twilight state of awareness, characterized by vivid dream-like imagery, that occurs as one is falling asleep.
The state where a person is going into a hypnotic trance.
Pertaining to drowsiness. It is usually used to describe hallucinations that occur as a person falls asleep.