"Wash, put on perfume, and get dressed in your best clothes. Then go down to the threshing floor, but don’t let him know you are there until he has finished eating and drinking. When he lies down, note the place where he is lying. Then go and uncover his feet and lie down. He will tell you what to do.” Ruth 3:3-4
I understand all of this verse except the uncover his feet part. Why would you do that to anyone who is sleeping?