I've been riding as much as possible for two reasons - 1. To get my bod in the best shape possible prior to the back surgery; and 2. I know it is going to be some time after the surgery until I can ride again. I want to get as much in as possible. I am also lifting, resistance exercises, stretching, etc.
One of the things I have been doing is early morning bicycling using lights. I know some of you who regularly do this, but I would suggest to others that, given the opportunity, it is a really fun thing to do, especially if you have a safe place to ride.
I get out between 5:30 - 5:45, temperature right now is usually about 45F, sometimes warmer. I regularly meet a few other folks with lights on their bikes - some are commuters, a couple are as crazy as I am and just ride for fun. I ride our local trail system, which is most uncrowded at 5:30 am.
I have two bikes with lights. I have dual front lights and a red blinkie and small LED white blinkie on the back on my "utility road bike." I wear a yellow jacket, and, overall am quite visible. My mtn bike has a Cateye very bright light, and a red blinkie.
Anyway, if you haven't tried it, give it a go. It is a whole different and fun world out there in the dark!!