You are most likely aware of the concept of 'lucid dream'. That is to say 'dreaming while aware that you are dreaming'. However, you might not be aware of, at least, one danger of such a dream.
Suppose your lucid dream is so vivid that it looks exactly like in a real world. In addition to that, suppose you dream about being exactly in the room you are sleeping in. This is, of course, a weird coincidence, but it happens! Now in the lucid dream, 'miracles' are happening, and so teleportation happens easily. So you dream that you are walking around your room. But suddenly, you find yourself inside your bed, and you think that well, teleportation has happened. In reality, you have just woken up from the dream but you think that you are still in the lucid dream! Of course this can be dangerous if you go around thinking that 'miracles' can still happen!
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Only the body sleeps.
I am aware that I am awake even when I am asleep.
I sometimes have dangerous scenes in my dreams.
However, at that time, I realized that "it's okay because it's in a dream".
...But I am careful not to lucid-dream about being around the very room I am sleeping in, lol!😆
However, it is true that you will eventually realize that you have woken up, but it will take some times, maybe two minutes or so. When you wake up, your senses don't quickly pick up, and this is particularly significant when waking up from a lucid dream.
Now in a lucid dream, this is even worse because you are 'almost awake'! In the usual dream, near day time, if you happen not to have closed your eyes well, you often can see things in your own room and think that you are dreaming about them, and you will only realize this after you awaken! You can see that this is automatically worse off in a lucid dream, the remaining thing is that can you walk while dreaming? The answer is yes, it can happen, and this is called 'sleep-walking'. So the ability of the brain to tell the 'dream' state from the 'wake' one is not perfect, and sleepwalking is one such example of the failure.
To understand what I am saying, just combine a little bit of 'sleepwalking' with the common blending of 'real' signals (eg a knock at the door), with the dream world, but now in a lucid dream! You note that obviously this scenario can happen! In fact it is easier to happen in a lucid dream cause you are 'almost awake'!
Anyway I think you must have differing notions of what lucid dream sleep is, compared to my own,so lets just say we beg to differ...as in reality all sleep no matter if its lucid or not is dangerous really,I say this because no one actually remembers the exact time when they actually fall asleep in the first place,isn't that dangerous to not know when your own consciousness of a sequence is no longer able to be remembered,plus how can you remember what your forced to forget ...and no one actually can proove beyond a doubt that this reality isn't any different to the dream world reality either.. as its claimed this reality is but a holographic reality after all.then throw the astral plane into the picture and alternate realities & the multiverse also and you really have a mixed up world that even some in physic's & science cant fully explain & thus have just theories..then bring OBE's & NDE's into this picture,as well as the astral realm, hypnopompic or hypnagogic dreams the list goes on,and yet we still dont fully understand what people see or how they see out of the body..