What is the preferred number of consecutive night shifts? results from a crossover intervention study among police officers in Denmark

At baseline, 49% of police officers in Denmark preferred four consecutive night shifts.

• At follow-up, 57% preferred the intervention of four consecutive night shifts followed by four days off.
• Preferences for two or seven consecutive night shifts were each reported by 26% of participants.
• Participants favoring longer night shifts reported finding night work less demanding.
• Those who preferred longer night shifts also found it easier to sleep at various times of the day.
• Evening types were more common among participants preferring longer spells of night work.

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