According to an article in HarvardScience
"Our data are consistent with the idea that sleep is primarily devoted to the critical activities of repair and reorganization in the brain, not the whole body, and that this reorganization probably includes learning and memory," "This leads to the conclusion that other organs and tissues do not require an analogous state because they can be repaired or reorganized during waking or resting periods."But then it is also worth mentioning that there are views that question the wisdom of mental activities such as the rote of learning and memory since our brain do these by natural design, and with far greater efficiency than any educational program could ever hope to achieve.
