Over hours of continuous blinking light in the sky, occasionally moving rapidly, as if circling.I pointed out to my wife a strange light in the sky about 9:00 PM last night, roughly to the N-NW of my house, very high and distant. It was twinkling like a helicopter or an airplane at night, however it would move side to side, then up and down quite rapidly, and at other times was quite stationary. We dicided it must be a helicopter seen from a great distance, circling as if searching. At no time did it vary from the same general spot in the sky, it simply would change direction, noticably, therefore NOT a star.Must to my surprise, I went out again after sleeping until about 3:00 AM PST, and IT WAS STILL THERE, with the same behavior. It is now almost 6:00 AM, and it is still doing the same thing! It has not changed from the same general direction in the sky, which you would expect if it was a star, (over time with the Earth revolving) but is still sometimes stationery and at other times, rapidly moving side to side, and occasionally slightly up and down.This has now been approximately 9 hours, which would be quite strange for a helicopter to be doing this for so long! I would like to know if others have noticed this strange behavior?