Not true. Many people, when they are conscious of the fact that they are dreaming, can detect the position of their body and even the movement of their limbs.
It's possible, but not required.
When your body enters sleep, your brain systematically shuts off signals to your motor functions.
And when I dream, it hardly ever entails any (direct) awareness of my physical surroundings.
However, it is possible for you to regain consciousness (fully wake up) and be without motor function. Many times, this phenonmenon is coupled with disembodied voices, strange forms, ringing of the ears, the feeling of pressure on the body.
Yes, and I have experienced similar things myself, where I in effect had to "wrench" myself awake.
Also, you can regain motor control and not regain consciousness, like sleep walking.
Yet there must be some rudimentary form of awareness, otherwise what's to keep you from walking into a wall?
I once had a dream of myself sleeping in a particular position (on my back with my knees bent a certain way) and facing the closet door with the bathroom light on and a feeling that something bad was going to happen. I realized I was sleeping, forced myself to wake up, and found myself in that position, facing the closet door, but the bathroom light was not on, and the perspective was a little off.
I once had a dream where I was walking down a dirt road with high steep banks. And a coyote approached, saying, "I'm not going to eat you. I'm not going to eat." And I'm thinking, "Oh yeah, we'll see about that," and I mustered all the strength I could in my leg, thinking I would kick him in the head, and bam! I kicked my foot smack into the wall.
I was dreaming, realized I was dreaming, evaluated my body position, and decided to wake up.
I have had dreams where I told folks I haven't died yet, so they shouldn't expect me to stick around too long. And they would go, "Huh? What do you mean? We have always been here." And about that time I would wake up and say, "See I told you so," and then do my utmost not to
crash their reality, which was usually to no avail. The best thing to do is forget it happen, albeit it doesn't usually happen right away.
Also, through meditation, it is possible to retain conciousness and lose the feeling of the body. It's also possible to modify your sense of self and feel disembodied, give yourself the impression of levitation, and start hallucinating monsters or people or voices. Buddhist monks have to put up with this all the time.
Yes, and I am merely asking whether this is internal to the brain or, an external signal that the brain actually receives. Also, remember we must override the sensory signals (which, are no doubt more prominent) before we can begin to detect any of this "other" activity.
Confuse your sensory perception and the brain really starts messing with your sense of reality. Just look at poor Emanuel Swedenborg.
Which, is when the brain really starts picking up on
weird signals, eh?