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Effect of the PER3 polymorphism on normalized slow wave activity (SWA) and normalized sympathovagal balance [LF/(LF + HF) ratio] during the first four non-rapid eye movement (NREM) and REM (NREM-REM) sleep cycles of baseline sleep and the first six NREM-REM sleep cycles for recovery sleep in 9 PER35/5 (solid symbols) and 13 PER34/4 (open symbols) individuals. Error bars represent SEs.
