If you have a dim or small light, such as a flashlight or led, you should use that, but make sure the contrast is higher than usual, and exposure is low, but not too low, where it will have lines. To see if it has these 'lines', take a few pictures of something, play them, and if there are lines, you will see them (They move).

You could place a filter on your light, too, and add an aperture so there is only light coming from a small spot.

Point a lamp (or two) away from the set. The reflected light will light your set; with just enought light to make it look like night.
This works really well.

If you want a bit of a cinematographic effect, you can try to tint your lighting blue a bit; not something I've tried, but I know some people have, and a lot of blockbuster movies do this in post to night shots.

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