Historically, men wore nightshirts and nightgowns for centuries because they provided superior comfort, unrestricted movement, and practical hygiene benefits during sleep compared to heavy daytime garments. Before modern central heating, sleeping in loose, flowing garments allowed body heat to circulate efficiently while accommodating seasonal temperature changes. Additionally, nightshirts were easy to launder, economical to produce, and served as a standard cultural norm across European and American households until modern two-piece pajama sets gained widespread popularity in the twentieth century.