I sometimes fish well into the evening for walleye. Some guys nightfish for burbot and 'eyes also. Also there is a particular species of chironimid that hatch during the night around the first of August, on a lake I fish. Big rainbows cruise with their backs out of the water gorging themselves on the pupa trapped in the surface film...they hatch all night and the rainbows usually feed until well after midnight...
Tight lines,
Trevor