I sleep with the air on and I make the bed everyday.  There is nothing like getting into the bed when it was made . . . that's like getting into the bed after running a marathon or something if you don't make the bed.  The bed has been open all day and if you needed to put something on the bed, you would be putting something in the bed.  When I was in college, it was essential when I lived in the dorm to make the bed because even though I preferred that people didn't sit on my bed and actually asked them not to, there is no telling what happened on my bed when I was out of the room (though I think my roommates had more respect for me than that).  I learned to make the bed when I was a child and have been making my bed since then.  
