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The circadian modulation of occurrence of non-rapid-eye-movement sleep (NREM) was investigated in 37 volunteers under dim-light conditions after 24-h total sleep deprivation using a 26-h 10/20-min ultra-short sleep–wake schedule. The propensity of NREM showed rapid increase followed by gradual decrease during the subjective day and nocturnal bouts during the subjective night coinciding with melatonin...
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