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slp_maint_eff under Sleep Monitoring/Polysomnography/Sleep Architecture in CCSHS variables
Sleep duration (i.e., total sleep time, TST) is the interval between sleep onset and sleep offset time while asleep. Sleep period is the interval between sleep onset and sleep offset time.
slp_maint_eff under Sleep Monitoring/Polysomnography/Sleep Architecture in CHAT variables
Sleep duration (i.e., total sleep time, TST) is the interval between sleep onset and sleep offset time while asleep. Sleep period is the interval between sleep onset and sleep offset time.
ttleffsp_f1t3 under Sleep Monitoring/Polysomnography/Sleep Architecture in NUMOM2B variables
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). Sleep period is just the interval between sleep onset and sleep offset time.