While staring at the sky from my bedroom window trying to sleep, I saw a object with light on, it disappears after a couple seconds. I thought it was just an airplane. But it came back couple seconds later. I took a close look. It was a circular object with 3 bright white lights attached. It was moving within a small perimeter. It was not spinning or blinking. It appears and disappears in couple second cycle. When it disappears, it seems to disappear completely.