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The basic definition of lucid dreaming requires nothing more than becoming aware that you are dreaming. However, the quality of lucidity can vary greatly.
Lucidity is not synonymous with dream control. It is possible to be lucid and have little control over dream content, and conversely, to have a great deal of control without being explicitly aware that you are dreaming.
When asleep, both groups showed similar changes in brain activity in response to hearing their names, which were played quietly enough not to wake them. However, when awake, high recallers showed a more sustained decrease in a brain wave called the alpha wave when they heard their names, compared with the low recallers.
A well-established theory suggests that a decrease in the alpha wave is a sign that brain regions are being inhibited from responding to outside stimuli. Studies show that when people hear a sudden sound or open their eyes, and more brain regions become active, the alpha wave is reduced. In the study, as predicted, both groups showed a decrease in the alpha wave when they heard their names while awake. But high recallers showed a more prolonged decrease, which may be a sign their brains became more widely activated when they heard their names. In other words, high recallers may engage more brain regions when processing sounds while awake, compared with low recallers, the researchers said. While people are asleep, the alpha wave behaves in the opposite way —it increases when a sudden sound is heard. Scientists aren't certain why this happens, but one idea is that it protects the brain from being interrupted by sounds during sleep, Ruby said.
Alpha waves are one type of brain waves detected either by electroencephalography (EEG) or magnetoencephalography (MEG) and predominantly originate from the occipital lobe during wakeful relaxation with closed eyes. Alpha waves are reduced with open eyes, drowsiness and sleep.
Neuroscientist J. Allan Hobson has hypothesized what might be occurring in the brain while lucid. The first step to lucid dreaming is recognizing one is dreaming. This recognition might occur in the dorsolateral prefrontal cortex, which is one of the few areas deactivated during REM sleep and where working memory occurs.
Dreams are not dreams, they are our astral bodies visiting other dimensions. Oobe or obe, out of body experience and other great information and videos by Rich2150x on YouTube holds the answers you are looking for.