Yes, little razor gnomes creep out during the evening and make the edge less sharp!
Actually, The purpose of stropping it to clean the edge but also to remove any oxidation that has occurred, and it has, it starts as soon as water, steel and air mix, burnish the bevel, realign the edge ( it does get unstraight) and a very slight sharpening from the silica in the strop.

The end result is a clean, rust free, straight, very sharp and much more comfortable edge.