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Comparison of long and short sleep durations in free-running sleep-wake cycles

and Benoit [17] noted a decreased amount of R E M sleep which is confirmed by our data. The slow wave sleep rebound at the first day sleep could be expected because of the long prior wakefulness. However, the data of Foret and Benoit [17] are not in agreement with this expectation and our results. The striking change from night sleep to day sleep in the distribution of the amount of R E M within the sleep period has already been observed several times [17, 23, 39,42]. Summing up, our data show differences between day and night sleep but no essential differences of quality between morning and afternoon sleep during experimental shiftwork studies. Therefore, it is not possible to recommend a special strategy concerning the position of day sleep between night shifts.