Sleep and learning
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Many competing theories have been advanced to discover the possible connections between sleep and learning in humans. One theory is that sleep consolidates and optimizes the layout of memories, though recent evidence suggests this may be restricted to explicit procedural memories.
Popular sayings such as "sleep on it" or "consult the pillow" reflect the notion that remolded memories produce new creative associations in the morning, and that often performance improves after a time-interval that included sleep. Many studies demonstrate that a healthy sleep produces a significant learning dependent performance boost. Healthy sleep must include the appropriate sequence and proportion of NREM and REM phases, which play a different role in memory consolidation-optimization process. In motor skill learning, an interval of sleep may be critical for the expression of performance gains; without sleep these gains will be delayed (Korman et al, 2003). However, several studies show that, in some conditions, time after training, even without sleep, may suffice for attaining significant performance boosts (Roth Ari-Even et al, 2005).
Sleep in relation to school
Sleep has been directly linked to the grades of students. One in four U.S. high school students admits to falling asleep in class at least once a week.. Consequently, results have shown that those who sleep less do poorly. In the United States sleep deprivation is common with students because almost all schools begin early in the morning and many of these students choose to stay up awake late into the night. As a result, students that should be getting between 8.5 and 9.25 hours of sleep, are getting only 7 hours. Perhaps because of this sleep-deprivation, their grades lower and their concentration is impaired.
Other researchers' theories on additional functions of sleep differ significantly. One older idea is the energy conservation theory. Others claim that REM sleep is needed to "refresh" the brain after NREM phase, or that REM is needed to prevent stasis of fluids in the eye.
- Robertson, E.M., Pascual-Leone, A. and Press, D.Z. (2004). Awareness modifies the skill-learning benefits of sleep. Current Biology 14, 208-212.
- "To understand the big picture, give it time -- and sleep", EurekAlert, April 20 2007. Retrieved on 2007-04-23.
- Wagner, U., Gais, S., Haider, H., Verleger, R. and Born, J. (2004). Sleep inspires insight. Nature 427, 352-355.
- "Study puts us one step closer to understanding the function of sleep" - from University of Wisconsin-Madison School of Medicine and Public Health
- "To sleep, perchance to learn" - from Nature
- "Birds May Refine Their Songs While Sleeping" - from Science
- "Study shows sleep helps improve memory" - from CNN