Wild cavefish can somehow survive with almost no sleep.

The article discusses how a species of cave-dwelling fish, the Mexican tetra, can survive with minimal sleep, with some individuals sleeping zero hours. Research conducted by Alex Keene at Texas A&M University, in collaboration with researchers in Mexico, has shown that this sleeplessness trait has evolved independently on at least three occasions. The study suggests that the fish may have adapted to not sleep due to factors such as the need to search for food or heightened sensitivity to vibrations. This research provides valuable insights into the unique adaptations of cave-dwelling fish populations. [Extracted from the article]