When we go to sleep, our consciousness undergoes certain changes, but there is no scientific evidence to suggest that it shifts from the third dimension to another dimension or travels through time. Sleep is a complex physiological process that involves various stages and functions.
During sleep, our brain goes through different stages, including non-rapid eye movement (NREM) sleep and rapid eye movement (REM) sleep. These stages are characterized by distinct patterns of brain activity, eye movements, and physiological changes. The exact functions of sleep are still not fully understood, but it is known to be important for processes like memory consolidation, restoration of the body, and overall well-being.
Consciousness itself is a subject of ongoing scientific investigation and philosophical debate. While we have made progress in understanding certain aspects of consciousness, such as its neural correlates and the states of awareness associated with wakefulness and sleep, there is still much we do not know. It is currently considered a complex emergent phenomenon arising from the interactions of neural processes in the brain.
As for traveling through time, there is no scientific evidence to support the idea that our consciousness travels through time during sleep or in any other state. Our perception of time during sleep is often altered, and we may have dreams that seem to encompass extended periods, but these experiences are typically considered to be constructs of the sleeping mind rather than actual time travel.
It's important to distinguish scientific understanding from speculative or metaphysical concepts. While the nature of consciousness and the mysteries of sleep are fascinating topics, our current scientific understanding suggests that our consciousness remains within the confines of the physical brain and does not shift to other dimensions or travel through time during sleep.