Artificial light at night is a wide-spread human modification of the natural light environment, yet only recently has it gained attention from ecologists. This session seeks to update the ecological community about recent advances in artificial light research and to increase awareness of the potential effects of artificial light on ecosystems. This session will emphasize the breadth of the problem of artificial light at night, with research presented from both terrestrial and aquatic systems. By including research on a wide variety of organisms and ecosystems, this session will not only cover the various ways artificial light may influence any organism (decreased fertility, increased mortality, altered feeding), but also communicate the importance of taking artificial light into account even when not studying it specifically.