I tricked the eye. I made the sky .tga files darker to the point where the bottom goes to a solid black. Then I used the texture BLACK for the whole bottom of the map so that the skybox seemlessly goes into the black textured brush at the bottom of the map.
So now not only does it look more like a night map now.
[Blocked Image: http://forums.hostileintent.org/uploads/post-18-1106810984.jpg]
But it makes the player models happy standing over the func_wall railings since below him is a solid brush.
[Blocked Image: http://forums.hostileintent.org/uploads/post-18-1106851854.jpg]