On Friday, 7 February 2020 11:47:08 UTC, John wrote:
Night driving is made harder by:
People with dirty and poorly aimed headlights.
Houses with exterior floodlights aimed to light up the air.
Buildings with bulkhead type lights that just throw the light everwhere.
Cyclists who deliberately seem to aim their intensive lights at the eyes
of drivers.

And pedestrian crossings with low refresh rate LED displays at eye level (for the pedestrians) - move your eyes across and you get a line of red dots hanging in the air.

And several disorders such as hypothyroidism.

And winter. It is usually much easier on summaer nights.