Hotel "why" question #2: beds.

What is the idea of making up beds with the sheets tucked so that they come only about 3/4 of the way up the bed? If you want to actually be under the covers and not have your chest and shoulders exposed, you have to untuck the covers at the foot of the bed, pull them all up, and retuck them. When you’ve done that, they’ll make them up the same way the next day anyway.

We have seen this at three places we’ve stayed. It never used to be the custom anywhere I ever traveled. I can’t imagine the point of it, and I can’t believe that most people actually like it this way. What’s the explanation for this practice, and how widespread is it?