I’ve been journaling my dreams for a while now, and I think I experience two different kinds of hypnagogic hallucination. Is this usual?
- The first kind I only experience occasionally, almost always when my sleep has been disrupted (e.g. if I’ve had to go to bed a couple of hours later than normal for work reasons). These are only experienced within a few minutes either before falling asleep or after waking.
a. The auditory version is a short burst of meaningless speech, of about 1 second in duration. The particular speaker’s voice is recognizable, and it’s possible to pick up the emotional emphasis on syllables, but there are no recognizable words. It is as if a long audio recording of someone speaking has been cut up into individual phonemes, which are then replayed in random order. It’s distinguishable from real sound because the words make no sense (and stop after about 1 second).
b. The visual version is about 1 second in duration, and is visible in bright light from the real world (e.g. with the bedroom light on). Usually accompanied by a hypnic jerk. ie. I’m seeing the real world in bright light, I see something in the scene that appears completely real but isn’t, I feel as if I’m falling and then the hallucination disappears.
Both 1(a) and 1(b) feel as if my experience of the real world has had about 1 second of dream edited in to it (to use a film-editing metaphor). My guess as to what causes them is that they’re episodes of micro-sleep: I fall into dream state for about 1 second and then wake up again.
- The second type of hallucination occurs more often, in fact pretty much every time I try to go to sleep. The visual hallucinations differ from 1(b) in that they’re only visible in darkness or very dim light: bright light from the real world, or even just trying to imagine something, will dispel them. The length of the hallucinatory period is typically several minutes, but individual images within it are of much shorter duration (typically less than 1/2 second) and they make no coherent sense (they either look like phosphenes, or something a bit like the paintings of Hieronymous Bosch). These are usually also accompanied by a form of hypnic jerk. Somewhere in the middle of the couple of minutes of hallucination I’ll experience an involuntary muscle contraction, like receiving an electric shock, often accompanied by a sensation of falling.
This type feels more like dreams “solidifying”. They start out as completely incoherent collages of images, and slowly become replaced by something that has more of a story to it.
Much of this sounds like a text-book description of hypnagogic hallucination, but I don’t think I’ve heard before that there are two types. The difference seems to be between awake->microsleep->awake versus awake->slowly starting to fall asleep->full dream state.