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Updated: Sep 9, 2025

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
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Weekday-to-Weekend Sleep Differences and Poor Mental Health in Young Adulthood.

Minjae Choi1, Joshua Kirabo Sempungu2,3, Joon Hee Han3,4

  • 1Institute for Future Public Health, Graduate School of Public Health, Korea University, Seoul, Korea.

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|September 2, 2025
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Summary

Large weekday-to-weekend sleep shifts are linked to poor mental health in young adults. This sleep pattern may indicate issues like unhappiness, depression, and suicidal thoughts.

Keywords:
KoreaMental HealthWeekday-To-Weekend Sleep DifferencesYoung Adulthood

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Area of Science:

  • Sleep science
  • Mental health research
  • Young adult health

Background:

  • Investigating the relationship between sleep pattern variability and mental well-being in young adults.
  • Examining how weekday sleep duration influences the association between sleep shifts and mental health outcomes.

Purpose of the Study:

  • To explore the connection between weekday-to-weekend sleep duration differences and mental health indicators.
  • To determine if weekday sleep duration modifies this association among South Korean young adults.

Main Methods:

  • Utilized data from the Survey of Korean Youths' Lives (n=14,931, ages 19-34).
  • Calculated weekday-to-weekend sleep differences and assessed mental health indicators (unhappiness, life dissatisfaction, burnout, depression, suicide ideation).
  • Employed logistic regression, stratifying by weekday sleep duration (<7 hours vs. ≥7 hours).

Main Results:

  • Nearly 50% reported 1-2 hours more weekend sleep; 17% reported >2 hours more.
  • 38.5% had <7 hours of weekday sleep, often compensated by longer weekend sleep.
  • Greater sleep duration differences were significantly associated with poorer mental health, including increased risk of unhappiness, depression, and suicidal ideation.

Conclusions:

  • Significant weekday-to-weekend sleep differences may serve as a marker for poor mental health in young adults.
  • Further research is warranted to elucidate the underlying mechanisms connecting sleep variability and mental health challenges.