2011, Charlotte Knight, "You snooze, you lose", The Daily Titan (California State University, Fullerton), Volume 89, Issue 13, 24 February 2011, page 4:
So we would attempt to nap. But as he had a twin bed, space was limited, so I would insist he be the big spoon and I be the little spoon.
It's a scene played out in bedrooms all over America: after minutes or hours of cuddling, the big spoon rolls off the little spoon and turns his or her back.
2013, "The Bardian's Guide To Sharing A Bed", Bard Free Press (Bard College, Annandale-on-Hudson, New York), Volume 14, Issue 5, February 2013, page 19:
Keep in mind, though, boner pokes from the big spoon might get in the way of sleep. If the big spoon has a penis, that is.