Nightmares
Lucid nightmares and astral nightmares.

In dreams, there are two cases where we realize we're dreaming: a) Astral projection, where we're usually in soul form, walking through streets or even traveling to another plane, but as explorers since we cannot alter what happens there. b) Lucid dreaming, which is like a system glitch, somewhat similar to sleepwalking but in reverse, as our conscious mind invades the dream and takes control of it. In a lucid dream we can do whatever we want, modify the dream, make anyone appear, etc. As if we were gods. The point is that something similar happens with nightmares, as there are: ASTRAL NIGHTMARES, which occur in the astral plane. Even in some esoteric practices, when someone performs witchcraft on us while we sleep, they say they "pull your soul." What happens is that a malevolent entity bothers us in the astral plane.




One of the most common cases is when something won't let us wake up, and though we eventually do wake up (since it's impossible to stay in the astral plane unless someone kills us in reality while we sleep), these are unpleasant experiences. It can be summarized as attacks during astral travel. The other case is LUCID NIGHTMARES, which happen within a lucid dream. This generally occurs when we haven't rested well and realize we're dreaming, but in this case, we realize we're inside a nightmare. However, upon realizing this, we can either wish to wake up and do so immediately, or alter what happens in the nightmare. For example, if in the nightmare we're being attacked by monsters and we realize it's a nightmare, we can turn them into rats and crush them. However, if we can't do this (alter reality), it means it's an astral nightmare and not a lucid one. Though it's worth mentioning that in an astral nightmare, one can summon powers or make weapons appear using certain techniques, even though we can't alter the nightmare's reality. So if we manage to defeat the monster, it's because we're spiritually stronger than our attackers. Otherwise, the opposite occurs, and though we'll eventually wake up, some energy will have been stolen from us, making it very common to feel tired during the day in these cases.