Chronotype-specific Sleep in Two Versus Four Consecutive Shifts

Apr 20, 2021Journal of biological rhythms

Sleep Patterns for Different Body Clocks During Two Versus Four Back-to-Back Work Shifts

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Abstract

Increasing night shifts from two to four resulted in greater sleep debt for early and lower sleep debt for late chronotypes.

  • Sleep debt varied based on chronotype, with early types accumulating more sleep loss over four consecutive night shifts.
  • Late chronotypes experienced reduced sleep debt after four night shifts, indicating a different response to shift length.
  • No significant interaction effects were observed between shift sequence length and chronotype for morning shifts.
  • Social jetlag remained unchanged regardless of the number of consecutive night shifts.
  • Including naps did not alter the relationship between shift length and sleep debt.

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Key numbers

5.4 h
Increase in Sleep Debt for Early
Average cumulative sleep loss after two night shifts.
3.1 h
Decrease in Sleep Debt for Late
Average cumulative sleep loss after two night shifts.

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