Why Do We Dream? Maybe to Ensure We Can Literally 'See' the World upon Awakening
Briefly

A more recent theory suggests nighttime dreams protect visual areas of the brain from being co-opted during sleep by other sensory functions, such as hearing or touch.
Similarly, people who lose sight or hearing show heightened sensitivity in the remaining senses because the region of the brain normally used by the lost sense is taken over by other senses.
Read at www.scientificamerican.com
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