The traffic law here says that you have to have a rear reflector, side reflectors, and a front light to ride at night. If you only do this, of course drivers coming from behind are going to be your biggest concern. I usually use a flashing red light on the back as well, even though I look like a dork doing it.
You also have a lot more control in avoiding the turners. They're pretty easy to spot. When drivers come up behind you, you're counting on them seeing you, which is not a good assumption to make.
I hate riding at night. Last night I had to ride by the frat house section of town, which I loathe. I'm just extra careful over there. It still makes me mad, even though I know they're going to turn as if I'm not there and I slow down to avoid the collision.