There are many. But those that we plant in our garden are:
POTATO, TOMATO, EGGPLANT, PEPPERS.

So are these plants that require darkness at night?

No it is a generic label for the Solanaceae family of plants and is reportedly derived from the fact that they contain an alkaloid poison brewed and used in ancient times to bring on the "shade of night" (aka death).

Dave

Here is a link that might be useful: What Are Night-Shades?