Visual acuity is reduced at night because a less-than-optimal amount of light reaches the retina in low-light conditions.
Wearing sunglasses at night can further reduce the amount of light reaching the retina, and therefore is not typically recommended — especially when driving at night — because it can worsen darkness-related visual impairment.
Even sunglasses with yellow or light amber lenses that are promoted as a way to enhance contrast during daylight could work against you at night.
However, if you live in Alaska or somewhere near the North or South Pole when there's nonstop sunlight near the summer solstice, it may be recommended to go ahead and wear your sunglasses at night during this "midnight sun" time of year!
