Japanese couples have traditionally slept separately due to communal living spaces and concerns over unwanted pregnancies or disease. However, modern trends and cultural beliefs have led to changes in this practice, with some couples choosing to sleep together while others maintain separate sleeping spaces for practical reasons or personal space. Futons are a unique aspect of Japanese sleeping arrangements that make it easier to create separate sleeping spaces if needed. As Japan continues to adapt to modern trends, it remains to be seen whether shared bedrooms or separate sleeping spaces will become the norm.