||There is an increasing body of evidence indicating possible health effects from prolonged exposure to artificial lighting after dark. Both compact fluorescent lights and light emitting diode lamps have a greater proportion of blue light in the emission spectrum than the older incandescent light sources. Exposure to the blue light component at night has been the subject of ongoing research, with a number of published studies linking blue light content to the disruption of the internal body clock, suppression of melatonin production and various ocular effects. Aside from short-term discomfort, possible health effects include long-term chronic illnesses, including cancer, cardiovascular disease and diabetes. A brief review of recent research is provided, salient health issues are noted and discussed, and some examples of exposure minimisation strategies are suggested.