A moment of tranquility
Although simple in its rendition, this is a very nice and serene piece of animation, which would make for a very fitting video projection in a chill-out room. This is indeed the sort of animation that you encounter all too seldom on Newgrounds, and it is a good showcase of how the medium of Flash can be used towards other artistic ends than the depiction of violence.
What I was wondering about though: Why does a sunrise fade into darkness, and not into a ray of light? Maybe you might want to change the ending transition to make this look more consistent - and also to leave the viewer with a more cheerful feeling inside. That way the positive atmosphere gets preserved beyond the animation itself; ending in darkness, one's attention is immediately drawn to the closedness of the artistic representation, i.e. the "movie inside a box" perspective. Other than that, it is a beautiful piece.