Adaptation and readaptation to different shift work schedules measured with sleep diary and actigraphy.

Sleep efficiency was higher during day shifts compared to night and swing shifts in offshore oil workers.

• Adaptation to swing shifts was more challenging than to regular day and night shifts regarding sleep quality.
• Sleep quality was better during swing shifts than during regular day or night shifts in the first week of work.
• Total sleep time was longer during both day and night shifts compared to swing shifts across the two work weeks.
• Sleep efficiency, as reported in sleep diaries, was consistently higher during day shifts than during night and swing shifts.
• There were no significant differences in sleep during the readaptation phase following the work period across different shift schedules.

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