Triangular object in the sky with movement in the blink of an eye.

It was in the middle of the night.  I couldn't sleep and got up.  I went to the front door (which had a window in the top of it) to look outside at the neighboring houses.  We watched each other's houses to prevent crime.  I don't remember the date, or even the year.  I thought it was perhaps in the summer time because it was clear outside.  I was looking at the surrounding houses and happened to look up in the sky.  I was looking between two neighbor's houses.  In the sky I saw a triangle of 3 red lights.  The triangle seemed to remain in place for a period of time.  Then, in the blink of an eye, it moved from one place to another.  It didn't drift from one place to another like a balloon or a plane would do.  The lights weren't like an airplane's lights.  I came to the conclusion that it might be a UFO since I couldn't associate the lights or the movement with anything that I've seen here.  I've not seen anything else like it since.  This was my first experience with such a sighting.
Date is approximate.  PD