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mattm is going to disown me, but I've started using the trainer at night, even a few Zwift sessions (which are funner than Trainerroad but less structured). They do fill a gap of sustained (over 30 minutes) which is hard to find in the winter on weekdays. In the summer I can just do Oak Glen and Onyx, but those are iced up now.
I've had a few close calls at night (hit a bottle on a decent, almost went off a cliff) and its just not as effective. There's an effect riding in pitch black where the car lights open up your retinas and afterward you can't see where the road ends. Or maybe I'm just getting old and need glasses.
I could ride in lighted areas but those typically include stop signs and stoplights. Our training crit courses are fine but I have to drive to those.