Retirement indicates the end of people's participation in the labour force due to age, disease and other reasons. It is one of the major transitions of an individual's life and can have a significant impact on health outcomes (Apouey, Guven, & Senik, 2019). Retirement can lead to social isolation, a lack of physical and intellectual exercise and deterioration in mental and physical health (Rohwedder & Willis, 2010). On the other hand, retirement may reduce physical and mental stress and lead to a healthier lifestyle (Eibich, 2015; Shai, 2018). Increasing sleep duration is a key mechanism through which retirement affects health. Time spent on sleeping and working is often traded-off due to time constraints. However, people's sleep habits may be less constrained after retirement. Previous stud