>Change 6 beds when one is used? Talk about energy use and wear/tear on the linens themselves.

Depends how much you want to risk a guest sleeping in dirty linens. Maybe you have very trustworthy people you can rely on to accurately gauge if a bed has been used or not, maybe your guests do not mind the risk either in exchange for cost/environmental savings.

I prefer the most foolproof option when it comes to sleeping in between linens or using towels on my body.

We just have a card with a couple of chocolates (bribe) on each bed asking that if it is used, the card is removed, and if it isn’t used, it’s left in place. If there’s any doubt, the linens get changed. Means the guests don’t have to do anything by default, the environment takes one less insult, and we save on linen hire costs.