Sleep, alertness and performance across a first and a second night shift in mining haul truck drivers

Total sleep time was 9.05 ± 1.49 hours before the first night shift compared to 5.38 ± 1.32 hours before the second night shift.

• Performance declines were observed in participants who had less total sleep time in the 48 hours prior to their shifts.
• At the end of the second night shift, significant impairments in performance were noted compared to the end of the first night shift.
• Both night shifts resulted in equal levels of subjective sleepiness at their conclusion.
• Participants who demonstrated performance decline had shorter sleep duration before shifts than those who did not decline.
• Drive violations may be more sensitive to sleep loss than other performance measures assessed.

AI simplified