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Sleep architecture—the sleep–wake stages analyzed: (A) Stage N2 sleep with spindles. (B) Stage N3. (C) Rapid eye movement (REM) sleep. (D) Waking EEG. (E) N3–REM transition sleep period in a sham-operated rat. Note the K-complexes and sleep spindles (red bars). (F) N3–REM transition sleep period in a rat with traumatic brain injury and post-traumatic epilepsy.
