Oh bed sizes… and bed linen… so confusing 
I once did a lesson on this while teaching English in China and realized just how complicated it is for travelers (and by that score house sitters!!) It’s why (outside of UK) we don’t travel with our own linen as some others bravely do
Here’s a great image… at least for a few countries…
Here’s the link to the article as the image isn’t that clear… but it does demonstrate the complexity!!
Finally of course, don’t forget IKEA who have sizes unique to them 