5 or 6 lights in a straight pattern, fluctuating in intensity appeared and then disappeared in a very short time.I had a restless night and had trouble falling asleep the entire night. I was laying on my right side and my bedroom window was behind me. My dog was lying next to my back. She got up and I turned to look at her and I seen that her tail was between her legs. Something had spooked her and she does have a lot of sound phobias but I did not hear anything. I am pretty well versed in canine behavior and body language and have been studying this subject for a while now as I am working towards a career in this field. She jumped off the end of the bed and went to her “safe spot” underneath the bed.As she jumped, I noticed a bright light in my peripheral vision outside my window. I turned my head and looked and saw a line of 5 or 6 lights in a straight line moving at a moderate rate of speed. Maybe like 150-200 mph as a rough estimate. It seemed like it appeared out of nowhere. As I focused my eyes on it I noticed the lights were alternating colors of blue and white. They were all fluctuating in intensity and were going from bight to very bright. Suddenly, the craft just disappeared. I didn’t see it take off, it just vanished. I estimated it to be at an elevation of about 5-7 thousand feet. I continued to look for the next 25 minutes or so but saw nothing. The entire event lasted all but 2 seconds.This took place in the SSE direction and I live about 5-7 miles directly south of downtown Pittsburgh, Pennsylvania. I turned on my smartphone 20 minutes or so after the sighting to see what the weather condition were. It was cloudy with the cloud cover at 95% and the cloud ceiling was at 12,700 feet. Temperature 72 degrees, humidity 68%. Full moon.