I did a 5:15AM "dark ride" with DH this morning. Despite the fact we use our rear and front lights in the daylight, riding behind him in the dark almost blinded me! I had to ask him to stop and put it on a different flash setting. We only went 10 miles, but it involved a hill and at that time of the morning I am not too zippy. DH just wanted to get done and I tend to be slow and calmer in the early morning. It was nice and cool, and it's interesting to feel the changes in temperature as we go by farmland vs homes, low lying areas, etc.
There's a stop light about 3/4 a mile from our home. It turns from flashing to regular at 6 AM and one time I actually was riding through the intersection right at 6 when it changed. We missed it this morning by 5-6 minutes, but it's a stupid fun thing to try and do again.