I've been thinking, that it should be really cool to play a map with a slowly moving env_sun, or "beam" (Entity name), in the sky, and the sky colour changing from blue to dark-blue and then nite. For example, I start in that map, I wait 20 minutes, or less, and the map turns into night without any level change. I don't know if is this possible to do, but I would find it AWESOME for the mapper who can. Could anyone do it? Even with the most fake lighting in the map!