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Changes in granulocyte population for each participant over the 48-hr sampling period. For better comparability, cell counts per time point were calculated as a fraction of the mean for each individual. The gray bars indicate wake periods in a semi-recumbent position, < 5 lux; the black bar indicates the sleep period, recumbent position, 0 lux. Note the elevated values in some of the subjects during the sleep deprivation part of the study.
