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Aquanaut sleep patterns during tektite I: a 60-day habitation under hyperbaric nitrogen saturation.

Abstract : Four aquanauts lived in the TEKTITE I habitat at a 43-foot depth of sea water for 60 days under nitrogen saturation. The effects of this underwater habitation on quality and quantity of sleep were studied by sleep logs for all four aquanauts; and by electroencephalogram (EEG), electroculogram (EOG), and electrocardiogram for two aquanauts on selected nights during the 'dive'. Sleep was not a problem during the dive. Compared to pre- and postdive records, total sleep time increased during the dive. EEG delta activity, recorded from two aquanauts during sleep in TEKTITE I, was elevated over baseline levels. As the dive progressed, time of going to bed shifted to a later hour as did the time of arising in three aquanauts. Sleep logs agreed with EEG and behavioral data with respect to hours of sleep. Heart rate during sleep was increased in TEKTITE I compared to pre- and postdive sleep heart rates. (Author)