had 800 pupils aged 13–19 starting lessons at 10 a.m. instead of the normal 9 a.m. and reported that general absence dropped by 8% and persistent absenteeism by 27%. Similarly, a high school in Copenhagen has committed to providing at least one class per year for students who will start at 10 a.m. or later. College students represent one of the most sleep-deprived segments of our population. Only 11% of American college students sleep well, and 40% of students feel well rested only two days per week. About 73% have experienced at least some occasional sleep issues. This poor sleep is thought to have a severe impact on their ability to learn and remember information because the brain is being deprived of time that it needs to consolidate information which is essential to the learning process. See also Dream List of thought processes Lucid dream Preconscious Sharp wave–ripple complexes Sleep-learning Unconscious mind References External links "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 "Review of Studies showing sleep helps improve memory, learning" - from Science and Nature Sleep Sleep physiology Learning