Wakefulness Inebriation
If, while awake, certain neural processes can be altered, resulting in a lack of proper bodily functions, then the "opposite" can occur while the body is asleep. If certain neural processes are restored while lucid dreaming that are usually not active while dreaming, then proper dream-bodily functions will also be lost.
This theory is based on a hypothesis that if the body is dreaming, then the parts of the brain that function as awareness and control of the body are functioning in terms of the dreaming body, not the physical body. During REM, the waking body is in a state of atonia, or paralysis. In contrast to this, a dreaming body during REM is most often moving normally. In the experience of lucid dreaming, the ability to control movements is present at a similar level to waking life control. This points to the likelihood that certain brain and nervous system functions, for example, vestibular system functions, are still active while dreaming, but are reflected into the dreaming body rather than the waking body.
Suppose brain function while awake verses asleep are like a venn diagram. There are specific functions that are active while awake, active while dreaming, and some whose activity remains relatively constant in both states. However, when lucid dreaming comes into play, this venn diagram becomes fluid. Certain functions that are usually only active while awake, for example, the ability to meta-cognate, become active while lucid dreaming. It is the goal of the lucid dreamer to regulate this as to not become too "awake", which would result in the body waking up, and not too "asleep" which would result in the dreamer losing lucidity. An effect of the brain starting to become too "awake" during a dream is what I've coined, wakefulness inebriation.
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When experiencing wakefulness inebriation, there is a loss of control over thoughts and
movement. Similar to the described experience of being inebriated while awake, movement becomes disorganized and harder to do, and thoughts become incoherent or non existent. I propose that this suggests that during wakefulness inebriation the brain is becoming aware, or gaining interoception, of your physical waking body which is paralyzed.