The European robin (Erithacus rubecula) is often observed singing late at night illuminated by a street lamp. It is not a new behaviour, though the reasons for it are still unknown. Many studies look at the robins increasingly earlier dawn chorus, but that is a different end of the night. Studies on the behavioural effects of artificial lighting on other taxa reveal that specific lamp types can be detrimental to circadian rhythms, phenology, physiology, metabolism, health, migration, and orientation. It is hoped that this review highlights the importance of understanding the effects of ecological light and noise pollution on both individual species and their ecosystems. This research project puts forward and discusses in detail five possible theories to the robins nocturnal song behaviour: time changes to honest signaling; competing with noise; plasticity in active periods; larger eyes are more sensitive; and photoperiod sensitivity. Each theory is possible and emphasizes the lack of knowledge and research on urban wildlife. Of all the man-made pollutants, light pollution is the simplest to rectify, so this project makes simple recommendations on policy, lamp design, and public awareness and attitudes.