Harmonized - Polysomnography - HEARTBEAT Variables - Sleep Data - National Sleep Research Resource - NSRR

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	Name	Label	Folder
	nsrr_ahi_hp3u Apnea-Hypopnea Index : (Apneas and hypopneas with >= 3% oxygen desaturation) / hour of sleep	Apnea-Hypopnea Index : (Apneas and hypopneas with >= 3% oxygen desaturation) / hour of sleep Harmonized by the NSRR team. Data collected with no EEGs. Refer to the source for detailed definition for respiratory events: ahi_screening at Baseline	Harmonized/Polysomnography/Apnea-Hypopnea Indices
	nsrr_ttldursp_f1 Total Sleep Duration: the interval between sleep onset and sleep offset while the participant is asleep from home sleep apnea test	Total Sleep Duration: the interval between sleep onset and sleep offset while the participant is asleep from home sleep apnea test Estimated sleep duration, providing an approximation of total sleep duration (i.e. total sleep time) inferred from analysis of non-EEG channels Zhao et al., 2017 (PMID:27707441) Harmonized by the NSRR team. Source: index_time at Baseline	Harmonized/Polysomnography/Sleep Architecture