8/15/2023 0 Comments Introduction to deep sleep stageThe normalized transition probability from stage N2 to stage N1 was higher and that from stage N2 to N3 was lower in the adaptation night, whereas that from stage N3 to other stages did not differ between the nights. Bouts of stage N1 and stage N2 were shorter, and bouts of stage Wake were longer in the adaptation night than in the experimental night, but there was no difference in stage N3 or stage REM. Results: Conventional sleep variables reflected lower sleep quality in the adaptation night than in the experimental night. ![]() Cycle-by-cycle analysis was performed for the above variables in 34 subjects with four sleep cycles and compared between the two nights. Electroencephalographic and cardiac activities were subjected to frequency domain analyses. These variables were compared between the two nights. Sleep-stage continuity and dynamics were evaluated by sleep runs and transitions, respectively. Conventional sleep variables were assessed according to standard criteria. Methods: Seventy-four healthy adults participated in polysomnographic recordings on two consecutive nights. Objective: The aim of the present study was to characterize the cyclic sleep processes of sleep-stage dynamics, cortical activity, and heart rate variability during sleep in the adaptation night in healthy young adults. 5Department of Child Development, Osaka University United Graduate School of Child Development, Suita, Japan. ![]() 4Osaka University Health and Counseling Center, Toyonaka, Japan.3Osaka University Hospital, Sleep Medicine Center, Suita, Japan.2Graduate School of Education, The University of Tokyo, Bunkyo-ku, Japan.1Department of Oral Physiology, Osaka University Graduate School of Dentistry, Suita, Japan.Ai Shirota 1, Mayo Kamimura 1, Akifumi Kishi 2, Hiroyoshi Adachi 3,4, Masako Taniike 3,5 and Takafumi Kato 1,3,5*
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