Sleep quality, chronotype, and quality of life among Ukrainian students during war and armed conflict: A cluster analysis

Mar 13, 2026Sleep health

Sleep patterns, daily rhythm types, and life quality of Ukrainian students during war

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Abstract

67.7% of university students reported poor sleep quality under wartime conditions.

  • Poor sleep quality is more common among students living separately from family and those who consume alcohol.
  • Most participants (74.6%) were classified as having an intermediate chronotype, with fewer identifying as morning (9.2%) or evening (16.1%).
  • Evening chronotype is linked to lower vitality and increased alcohol consumption.
  • Lower physical and mental health scores are associated with poor sleep quality, with mental health being an independent predictor of poor sleep quality.
  • Four distinct profiles of sleep quality, chronotype, and quality of life were identified, ranging from optimal to less favorable.

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