Anyone who served in the U.S. armed forces in the last half-century or so is likely familiar with the standard-issue GI eyeglasses. With thick brown rims and lenses that looked like magnifying glasses, they were so unattractive that wearing them effectively reduced the chances of getting laid to near zero.
Benjamin Franklin nailed it when he said, "Fatigue is the best pillow." True story, Benny. There's nothing like pushing your body so far past exhaustion that you'd willingly, even longingly, take a nap on a concrete slab.