Bunk Beds only for Kids?

Don't we all had Bunk Beds when we were kids? Bunk beds are great space savers but we grow out of it eventually. I remember those times when nobody wants to sleep on the top part of the bed because we're too tired to go up or down in the middle of the night when we had to pee. Our bunk bed is still alive and the top bunk contains most of our trash, ehem stuffs, from school papers to nebulizers-name it we piled it there! Anyway, bunk beds or loft beds are as I have said, great space savers and every small home may get the option of getting at least one for their children.

What about your bunk bed story?