Adaptation across consecutive night shifts at 71°N under Arctic summer daylight and winter darkness: Effects on alertness, sleepiness, and fatigue

Key Points

• The study aims to investigate the effects of seasonal lighting on alertness, sleepiness, and fatigue during consecutive night shifts.
• Conducted in regions at 71°N during Arctic summer and winter.
• Assessed measures of alertness, sleepiness, and fatigue across consecutive night shifts.
• Compared adaptations in both seasonal photoperiods.
• Alertness, sleepiness, and fatigue impairments persisted across shifts in both seasons.
• Similar adaptations were observed across consecutive nights regardless of the season.
• Seasonal lighting did not significantly affect overall alertness or fatigue levels.