Grey Nightjars are crepuscular (active in twilight) and nocturnal (active at night). A very well camouflaged bird, they generally roost on the ground and are very hard to find.
I was lucky with this bird as it was perching right in front of my house. Sitting near the window I watched it for hours and documented it. A very odd behavior as it was out in the open and that also in broad day light. Perched in the same spot it would change position and jump to a fence nearby but be back to the same spot again.