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	Name	Label	Folder
	nsrr_ttldursp_f1 Total sleep duration: the interval between sleep onset and sleep offset while the participant is asleep from polysomnography	Total sleep duration: the interval between sleep onset and sleep offset while the participant is asleep from polysomnography Conventionally, this would be called total sleep time (TST) (i.e. total time spent in stage 1 or greater). Harmonized by the NSRR team. Data collected with no EEGs. Source: ttldursp_f1t3	Harmonized/Polysomnography/Sleep Architecture

Nulliparous Pregnancy Outcomes Study Monitoring Mothers-to-be