People who prefer staying up late and waking up late face a higher risk of developing symptoms of anxiety and depression, according to a scientific study of working adults.
The research, which examined 2,266 working residents in Finland, revealed that individuals with a late daily routine experience poorer recovery after the workday and greater difficulty balancing professional duties with personal life.
The findings were published in Sleep Health, a peer-reviewed journal dedicated to sleep science and public health.
To evaluate the relationship between sleep schedules and psychological well-being, scientists divided the participants into three categories: morning types, known as larks; evening types, known as owls; and those with an intermediate chronotype. Mental health problems were found to be most severe among participants who exhibited an extreme evening chronotype.
The investigation assessed several key factors of daily life, including the severity of anxiety and depression symptoms, the physical and mental ability to recover after work, and the degree to which job responsibilities intruded into personal leisure time. Night owls consistently scored worse across these metrics compared to their early-rising peers.
According to the authors, the heightened risk of anxiety disorders among evening types is linked directly to post-work recovery failures. The researchers concluded that inadequate rest after working hours and the ongoing breakdown of work-life boundaries partially explain why late sleepers suffer higher rates of mental health difficulties.
Understanding circadian rhythms and work recovery
Chronotype is the scientific term for an individual's natural inclination to sleep at a particular time during a 24-hour period. Regulated by internal biological clocks, circadian rhythms dictate body temperature, hormone release, and natural cycles of alertness. While morning chronotypes feel most energetic early in the day, evening chronotypes reach peak alertness later in the afternoon or evening.
In modern occupational health, experts frequently point out that conventional work schedules often conflict with an individual's innate biological clock. When individuals with evening chronotypes are forced to align with early work start times, they often face cumulative sleep debt, increased stress, and heightened difficulty unwinding.
Post-work recovery refers to the process by which an employee restores physical and mental energy after completing daily job duties. Effective recovery requires psychological detachment from workplace tasks during personal time. Sleep Health is an international peer-reviewed journal that publishes scientific research on sleep biology, behavioral health, and occupational well-being.
Recommendations for evening types and related research
In light of their findings, the study authors suggested that individuals who naturally favor late schedules should take deliberate steps to establish optimal conditions for recovery after their work shifts end. However, the researchers emphasized that their investigation does not prove a direct causal link, noting that a late sleep routine itself has not been shown to cause mental disorders.
The research adds to ongoing scientific efforts to identify lifestyle and environmental factors that impact psychological well-being. In previous related research, scientists found that living in close proximity to forest areas lowered the need for antidepressant medications, highlighting how external environments can influence mental health outcomes.
