This article explores the average bedtime in Japan and examines why Japanese people may be going to bed late. It is suggested that long working hours, cultural expectations around socialising after work or studying late into the night and access to technology are all factors contributing to later bedtimes. The impact of late bedtimes on health and wellbeing is discussed, with research showing that lack of sleep can lead to an increase in mental health issues such as depression and anxiety as well as physical health issues such as obesity, diabetes and heart disease. Strategies for improving sleep quality in Japan are also outlined.