There are a couple kinds of night vision, one of which will have daylight sensitivity penalties, and one which won't. If the night vision is based on low-light detection, such as seeing in faint starlight, then you might have a daylight issue because the sun will be overwhelmingly bright. A pair of quality Drow-made sunshades will fix that. This method does not work if there is not even a faint light source around.
If you have thermal vision, then you are able to see the self-emitted longer wavelength infrared photons which are generated as a function of the object temperatures per Planck's Law. In this case, thermal vision will work perfectly well day or night, indoors or outdoors, as long as there are temperature differentials. You can buy a thermal camera at the hardware store for a couple hundred dollars and try it out! Where this falls apart is when the average temperatures are either too low or high. If you are on Mars, for example, the extreme cold there means the peak Planck radiation is down closer to the radio wave spectrum, and it is very weak. And that is perhaps why there are no Duergar on Mars.
