The traditional working day doesn't benefit night owls(夜猫子), with people who prefer to stay up late twice as likely to underperform at work as early birds, a new study from Finland has suggested.
Early risers tend to work better early in the morning, while evening types are the opposite. The researchers asked 5,881 individuals born in 1966 in northern Finland about their working life and health and questioned them about their sleep patterns in 2012 when they were 46 years old. The study participants were monitored over a period of four years.
Ten percent of the men and 12% of the women were "evening types", 72% of whom worked in day jobs,the researchers found. A quarter of people classified as evening types rated their own performance at work as poor. This was a significantly higher proportion(比例) than among early birds.
"If evening types have to work in the early morning, they won't rate their work ability as high as morning types. The opposite would be true as well. If normal business hours were 3 p.m. to 11 p.m., the early morning types would feel worse than evening types," said Kristen Knutson, an associate professor at Northwestern University.
Suzanne Hood, an associate professor at Bishop's University in Qucbec, Canada, said that night owls shouldn't be alarmed by the findings.
"Rating job performance doesn't necessarily tell you about the quality of the work in real terms," noted Hood. "Also, the study was observational— it doesn't mean that being a night owl makes you less able to work."
"For example, the employee who seems like a slow starter in the morning might be the person who's most able to work effectively into the evening to meet an important deadline," said Hood. "If there is some opportunity for flexibility in scheduling, allowing employees some control over what time of day they complete their work may help to optimize(优化) performance and productivity."
