All the images you see in a nighttime environment come from specific sources. These could be actual light bulbs or from the moon, but either way they usually come from a fixed light location. To achieve night for night you have to set up your lighting pattern with this in mind.
Every light source has to be identifiable in a sense, or at least traceable back to a probable location when put under inspection. This means that they have to come from reasonable angles and locations. Light through windows, moonlight coming straight from above, and passing car lights are all possible ideas. At the same time the lights have to be very sharp, produce strong shadows, and have very fast falloff.