The only time I've ever slept in a bunk bed was at summer camp, and I loved it. While most of us aren't sleeping away in cabins, everyone can use space-saving furniture. For kids, lofted and bunk beds are a great option.
Bunk beds free up floor space in a shared kids room, and you can configure them to work for two, three, and even four beds. A lofted bed can work for kids (and, as in image 5, a baby and crib) as well as adults (Images 2 and 9).
Bunk & Loft Inspiration:
(Images: as linked above)