There’s a controversy among scientists about what sleep accomplishes, but many researchers believe that during sleep the brain consolidates memories, organizes the things that have been learned that day, and reinforces the changes in the brain that have been ushered in by the previous day’s activity

Brooks, David (2011-03-08). The Social Animal: The Hidden Sources of Love, Character, and Achievement (p. 94). Random House, Inc.. Kindle Edition.

There’s a controversy among scientists about what sleep accomplishes, but many researchers believe that during sleep the brain consolidates memories, organizes the things that have been learned that day, and reinforces the changes in the brain that have been ushered in by the previous day’s activity.”