Clustering of restorative sleep and lifestyle habits in Japanese male working population

Non-restorative sleep (NRS) affects not only individuals’ health, but also company productivity, highlighting the importance of measures in the workplace to improve sleep. This study aimed to examine the clustering of the presence of restorative sleep (RS) and lifestyle habits in a Japanese working population and to explore the characteristics of these clusters. The subjects were 58,150 Japanese working men aged 40−59 years who underwent health check-ups across the country from April 2015 to March 2016. Data for the presence of RS, the frequency and amount of drinking, smoking/exercise habits, and body mass index obtained from health check-ups were clustered with latent class analysis. In addition, the characteristics of each cluster were examined from the perspectives of lifestyle-related disease-associated blood test results obtained from health check-ups and the status of medical treatment at medical institutions as determined from medical claims data. Consequently, RS and lifestyle habits were found to form five clusters. The “NRS, no exercise, drinkers” cluster showed the highest probability of not achieving RS. An “Obese, occasional binge drinkers” cluster with a higher percentage of patients with sleep-apnea syndrome and a “Nondrinkers” cluster with proportions of those taking sleeping pills/anxiolytics and antidepressants/antipsychotics were observed. Furthermore, the “Daily smokers and drinkers” and “RS and drinkers” clusters showed a relatively high probability of achieving RS. These findings suggest that some individuals may not be aware of the sleep disorders caused by their drinking and smoking habits. Measures to improve sleep must be tailored to the characteristics of each cluster.