Have you had a less-than-stellar performance review lately? Do you daydream, or are you making bad decisions? It might not be about your job but about your sleep. And it’s not all your fault. They each study different aspects of health and aging. A recent study they conducted found that poor sleep may inhibit judgment and lead to off-task and distracting thoughts at work. Making sleep a priority can improve cognitive performance at work.
On days following shorter and poorer quality sleep than usual, workers reported more cognitive interference. Across the participants, sleeping just 16 minutes less than usual was with one additional point on the cognitive interference scale the next day. The participants also reported that after experiencing more cognitive interference on a particular day; they would go to bed earlier and wake up earlier than usual due to fatigue.
Apparent on workdays
The link between previous night’s sleep and next-day cognitive interference was more apparent on workdays; less on non-workdays. Perhaps participants have more opportunities for cognitive interference and fewer opportunities for sleep during workdays. The results suggest that putting a larger emphasis on optimizing sleep health will result in more effective work performance.
From this study’s results, they deduce that shortened sleep may reduce work productivity. Previous lab-based experimental studies have shown that sleep deprivation; such as restricting sleep duration to four or five hours has negative effects on performance in cognitive tests. However, there has been a lack of observational studies examining the relationship between sleep and cognitive functioning in participants’ own daily lives.
Our study adds empirical evidence that poorer sleep the night before work will result in slower mental activity; delayed decision-making and potentially an increase in mistakes. In previous collaborative work, I (Soomi Lee) also found that poor sleep can lead to experiencing more stressors and conflict the following day. On days following shorter and poorer quality sleep than usual, participants reported higher work-to-family conflict than usual.
Lower quality sleep
And on days following shorter sleep and lower quality sleep than usual; participants reported less time for themselves to exercise, and also less time for their children. Data for both studies are from a larger study called the Work, Family & Health Study, which was designed to examine multi-site companies within the information technology and the nursing home sectors. The two studies used a sample of IT workers, which represents a higher-income, professional-level workforce.
Workers in this occupational sector tend to work long hours and experience a permeable boundary between work and personal life. Overtime work, frequent phone calls after work hours, late work-related emails; early bird meetings, such as 7 a.m. or 8 a.m. meetings, may disrupt workers’ sleep. The findings show that workers’ sleep can impact job performance in multiple ways, including decision making and intrusive thoughts.
For example, they need to shut off phones and ignore emails after a certain hour, after 9 p.m. for example, in order to turn on a relaxed mode before bedtime and get at least seven hours of sleep. Regular exercise can also be beneficial to have good quality sleep. A challenge is that most workers feel they have too much to do and no time for sleep and exercise. However, they need to cut off the vicious cycle between poor sleep and poor performance. When sleep is stolen on a day-to-day basis; there will be a high cost to pay in terms of health in later life, and perhaps productivity tomorrow.