I was returning home from a party, time bout 4 AM, a bright, white disc, appeared to be a flying saucer, traveling about 1,000 mph, in straight line, due south; ascended over mountain; then descended out of view. The fact that I had been drinking at the party, I had to 'rub my eyes' to make sure. However, I had seen a white lighted disc, for sure, before. And this was the same type craft.Probably twice the size, moving slower, following the contour of the ground; then ascended over a mountain; could see it descending, until out of view.