Many people, organisms, and ecosystems are affected by light pollution. Astronomers are unable to see stars in the sky, limiting what they can research and observe. Life found in ecosystems, such as nocturnal life, become confused on what time of day it is. Light pollution also impacts the migration patterns of birds. People all over the world also are affected. It has been found that humans produce less melatonin, which leads to a lack of sleep, headaches, and an overall increase in stress.