They use the analogy of a person to divide up the categories. For example, there's "the brain"- for the mattress, "the personality"- for the sheets, "the heart"- for the covers, and "the pretty face" - for the pillows. They also include some bed-making tips from a well rounded group of sources, like a mattress shop, the Four Seasons Hotel, Bloomingdales, and even the US. Marines! Check out the issue for all the tips, or read the main article on their website here.
(By the way, in case anyone was wondering, the pretty pillows in the above photo are from ABC Carpet & Home in NY 212.473.3000.)
Images from Real Simple.