There are few things more calming and relaxing than warm sunshine in the morning. Regardless of how I feel when I wake up, seeing the sun always makes me feel better. Even during the winter I enjoy seeing the sun outside the window no matter how cold it might be.
I wonder if this is some primal instinct left over from the earliest days of human consciousness? The realization that we had survived another night with all the nocturnal predators that lurked around our ancestors must have triggered a sigh of relief, and that feeling still remains within us to this day.