1) if the glasses are a little (or a lot) out of date, the amount of blur produced by the error is dependent on the size of the pupil. So what may seem adequate glasses in the day-time may reveal their inadequacy at night.
2) The larger pupil may introduce into the optical system portions of the cornea with a different refration or abberation. This is fairly rare and not usually very significant, but it can be most marked, for example with early cataract.
2) Many people, some more than others, actually shift more short-sighted at night “night myopia”. It can sometimes be demonstrated with binoculars: set them for good distance focus in the daytime, and then see if, at night, the focus wheel has to be turned appreciably to get best distance vision.
Rarely, night driving glasses with an extra strength component can be useful. More often the hoped for effect is not achieved, or it turns out that the basic glasses were in fact slightly underpowered in the first place.

You may also have an unusual cornea shape which makes light go into your eye at funny angle when your eyes are dilated. If your eye doctor has it available, you may ask for a corneal topography test. It basically takes a picture of the surface of your eye and looks like an “elevations” map of the world.