Lady Pamela explained, “In England, the upper class always have had separate bedrooms. You don't want to be bothered with snoring or someone flinging a leg around. Then when you are feeling cozy you share your room sometimes. ... “If you can have that extra room, it's basically a luxury.”
Why do aristocrats sleep in separate rooms?
The concept of separate beds for the wealthy was no problem. Members of royalty and the wealthy often had their own separate quarters, but that's because they could afford to with their big houses. Likewise, beds and bedding were expensive even if you did have enough rooms for separate sleeping places.
Do William and Kate sleep in separate beds?
Prince William and Kate Middleton do not sleep together when traveling by train, according to royal insiders. The Duke and Duchess of Cambridge must sleep apart on the Queen's royal train because there are no double beds on board.