I don't have very good night vision either, but that is normal.
Consider the fact that at night less rays from light sources are bouncing off objects and into your eyes, to get the image you see.
I find at night, distances aren't very good for me, but that may be a mix of tiredness also. (Though I strain to see bus numbers in the day too, and detail in faces far enough away)
I find also, and I don't know the reason, but it may be individual rays, that in a really dark room, my visions a bit dotty, like a camera.
EDIT:
Some people, and I'm not joking, even see vision in slow motion, or even in bits. i.e, if a trains coming past, they'll only see frames that update slowly, rather than a moving train, so the train will be at the start point, then suddenly at the station for example