We found highly significant effect of sleep period with medium to large effect size on most SW parameters in addition to a strong sleep dependent effect and a significant interaction between the two factors independently of NREM and REM sleep duration at the preceding sleep episode demonstrating that the circadian phase when sleep is initiated modulates the time course of SW parameters during the night independent of the partial sleep loss present at some circadian phases ( Inline Supplementary Table S2 ).
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Circadian regulation of slow waves in human sleep: Topographical aspects.
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