There is always more to be said, but you might be interested in my previous answer to Did married couples actually sleep in separate twin beds as depicted in old movies from the ‘30s, ‘40s, and ‘50s? Or was it just for the propriety of the movies? Separate beds for spouses in one room were known of since the 1790s, and were recommended (for hygiene and for a restful sleep) and even fashionable from the late nineteenth century. Plenty of wealthy and influential people had their interiors designed with separate beds through the middle of the twentieth century. But it's not like married couples didn't sleep in shared beds throughout this time.

Many people attribute this to the Hays Code regulating morality on television and in the movies. As I explain in the linked answer, the Code caused people in the industry to overwhelmingly choose the separate-beds option, but it did not invent that option.