Changes in sleep pattern after sleep deprivation

Total sleep deprivation (TSD) was performed for one night with 11 healthy male students and three-consecutive-recovery night-sleep was recorded. Special attention was paid to the analysis of the individual difference in SWS(min, %) on the baseline and recovery nights. The total sleep time increased on the first recovery night compared to the baseline, but it decreased significantly on the second and third recovery nights. Stage 1(%) decreased significantly on the first and second recovery nights. Stage SWS(min) showed a significant increase on the first recovery night, while SWS(%) increased significantly on the first and second recovery nights. As for Stage REM(%), there was no significant difference between the baseline and the recovery nights. There was a positive correlation between SWS(min) on the baseline and that on the recovery nights. SWS(%) also showed the same results as those obtained with SWS(min). Between SWS(min) in the baseline and the increase rate of SWS(min) on the first recovery night, there was a significant inverse correlation, while there was a tendency to inverse correlation on the second and third recovery nights. As to SWS(%), there was a significant inverse correlation between SWS(%) in the baseline and the increase rate of SWS(%) on the first and third recovery nights.