This article discusses the average amount of sleep for adults aged 20-64 in Japan, which is 6 hours and 38 minutes per day according to a survey conducted by the Ministry of Health, Labor and Welfare. It also examines factors that affect sleep in Japan such as lifestyle choices, environmental conditions, cultural beliefs, and psychological states. Additionally, it covers traditional practices to promote quality sleep as well as technology and recent changes to sleeping habits in Japan. Lastly, it looks at mental health issues related with lack of adequate restful slumber among Japanese people due to difficulty balancing work life demands with personal needs.