Dark triangle-shaped craft silently moved over house, traveling from north to south.

I awoke and felt compelled to go to my bedroom window and immediately noticed a stark black triangle-shaped craft just above our home traveling in a north-south trajectory, rather slowly.  
It seemed completely silent and had steady glowing red lights on the bottom along the sides of the craft.  
It appeared to be quite large, not like an airplane but much larger by far.  
It was in the pre-dawn hours of the morning, and the sun had not yet risen.  
I watched the craft approach the horizon and disappear from view.