Cones can adapt to night vision, especially when there is moonlight present, and become 100 times more sensitive than in daylight. They require five or 10 minutes to adapt. Rods take 30 minutes to adapt, but become 100,000 times more sensitive than during daylight. On a moonless night, humans are almost entirely dependent on rod nerves for vision. Obviously, if you look into the headlights of a fuel truck 10 minutes prior to departure, it will take 20 minutes to readapt to night vision.
Visual illusions can occur in a variety of ways.
A highway full of cars can be mistaken by the brain for the true horizon. You will have to depend more on aircraft instruments at night. The horizon may blend into the surface of a large body of water, making it impossible to find. Stars may reflect off smooth water, making both the sky and water appear as one big star field. Night regs You can legally maintain proficiency for carrying passengers by making only three takeoffs and landings to a full stop every 90 days.