10Mentally AExhaustedSharpScore8642C20100-10-20Nights 5-7Nights 5-7Mental FatigueTotal Mood Disturbance-2000:30 02:30 04:30 06:3000:30 02:30 04:30 06:30Time of Night Not Re-EntrainedTime of NightPartially Re-EntrainedCompletely Re-EntrainedFigure 6—Mental fatigue (top) and total mood disturbance from the Profile of Mood States (POMS) (bottom)during night shifts. Higher mood disturbance scores indicate greater levels of mood disturbance.Remaining aspects of figure as for Fig 2. Statistical symbols denote significant main effects of group. †indicates a difference (P < 0.05) between the not re-entrained and <strong>com</strong>pletely re-entrained groups. *(P
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