It looks like sleep actually is akin to defragging a disk in a computer whereby disjointed files are defragmented and made contiguous to improve hard drive performance."During stage four sleep, Buzsaki explains, “it’s as if many instruments and members of the orchestra come together to generate a loud sound, a sound so loud that it is heard by wide areas of the neocortex. These sharp, ‘loud’ transient events occur hundreds to thousands of times during sleep and ‘teach’ the neocortex to form a long-term form of the memory, a process referred to as memory consolidation.” The intensity and multiple occurrence of those ripples also explain why certain events may only take place once in the waking state and yet can be remembered for a lifetime, adds Buzsaki."
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