Colour Vision goes out of style in Non-Human animals
Now that light is "invisible" , All of the Evolutionary Advantages that having colour vision gave goes out the window. Colour is unidentifiable in very low light , which means that theirs no real point in investing brain and eye power on colour vision anymore. This also translates over to organism that are colourful to transfer meaning to colour vision animals. Flowers turn white and gray , Butterflies become like or are replaced by moths , songbirds turn brown , etc. Also , their is a mass extinction of animal that have heavily invested on seeing in color or being seen in color. Owls replace Hawks and Eagles as masters of the sky , Bats out-compete birds and become WAY more common , the Octopus loses its powers , and things of that nature. Basically , all Diurnal animals either adapt of go extinct
Flashlight and Power Companies have a Field Day
Human power consumption goes WAY up. Growing nearly 100% over night (If you'll excuse the pun). Now that people need to light their homes for their entire waking period , power company revenue skyrockets and they can charge whatever they want ( Though it's not like they can't do it already ). Due to this , more and more people will instead rely on generators for power. Poorer areas will be characterized by being dark ( though it's not like they aren't already ) , and cities will use a SHIT TON of energy ( excuse my language ). Also , flashlights will be needed for all daily outdoor activities , so they become as essential as toothbrushes , and Flashlight companies also make a killing.
Walks become less common as the World becomes more Dangerous
Most crime happens at night because its night , especially violent crime. If night becomes permanent , then crime rates dramatically go up. Walks become much less common , especially in urban areas , and daytime activities like going to the park and going fishing nearly vanish all together. Due to this , societies become much more indoorsy , and weapons like guns and knives become more of a household item across most countries and cultures.
Also , sleep cycles become much more arbitrary , while the schedule of daily life remains loosely based off of life before eternal night simply due to the fact that post-night time-of-day schedules are well establish , yet become less and less important as time goes on due to the arbitrarity of the sleep cycle which heavily impacted pre-night daily schedules.