The impact of chronotype on circadian rest-activity rhythm and sleep characteristics across the week

Male volunteers (n = 24, mean age = 23.46 y) exhibited differences in sleep and activity patterns between weekdays and weekends.

• Both Morningness and Eveningness Chronotypes showed increased activity and later sleep times on weekends compared to weekdays.
• Significant differences in sleep timing and duration were noted between chronotypes on individual days of the week.
• Morningness Chronotypes generally adjusted their sleep duration, timing, and quality more rapidly than Eveningness Chronotypes during transitions between the weekend and workweek.
• The interactions between chronotype and the day of the week may influence behavioral rhythms and should be considered in studies of circadian rhythms.
• Findings are preliminary and should be interpreted with caution due to the limitations of the modeling approach and the homogeneity of the sample.

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