Finnish Study Links Evening Chronotype With Poorer Work Recovery and Mental Health

People with an evening-oriented circadian rhythm reported more difficulty recovering from work and more mental health problems than morning-oriented participants in a population-based Finnish study published in Sleep Health.

The research included 2,266 working-age individuals in Finland. Participants were grouped as morning, evening, or intermediate types according to their circadian rhythms. Researchers examined symptoms and diagnoses related to depression and anxiety, whether work intruded into leisure time, and how effectively participants recovered after work.

Mental health problems were most pronounced among extreme evening types, according to the study summary reported by Medical Xpress. Evening types also described greater difficulty balancing employment with personal life and had less healthy lifestyles than morning types.

The researchers specifically investigated whether work-life balance difficulties could help explain the relationship between chronotype—the tendency toward earlier or later daily activity—and mental health. They found that the apparent association between being a night owl and anxiety disorders appeared to be related to poorer recovery from work and greater spillover between work and personal life.

Differences in health behavior did not explain the work-life balance or mental health patterns highlighted among the different circadian groups. The findings therefore point to recovery and the boundary between work and non-work time as important factors associated with mental health among evening-oriented workers, rather than establishing a direct effect of chronotype alone.

Because the study was population-based and examined relationships between reported characteristics and outcomes, its results do not show that having an evening chronotype causes anxiety, depression, or impaired recovery. The supplied report also does not describe an intervention testing whether changing work schedules or recovery practices improves mental health outcomes.

Ilona Merikanto, the study’s principal investigator, said the findings could help identify people who are more vulnerable to negative effects of working life and support more targeted efforts around work-life balance and recovery. That statement describes a potential application of the research, not a tested intervention.

The study, titled “The role of recovery from work and work-life spillover in the association between chronotype and mental health problems: A population-based study,” was published in Sleep Health in 2026.