Sleep or sleep-like behaviour has been observed in most animals examined, from invertebrates to mammals.  Sleep is ecologically important as it renders the sleeping individual vulnerable to environmental stressors, yet the evolution of sleep and its ecological context remain poorly understood. Reptilian sleep in the wild is likely to be influenced by ecological processes of predation, competition, and thermoregulation. In this talk, I present an overview of what is known of sleep ecology in reptiles. I illustrate such ecological constraints and sleep strategies (e.g. for predator-avoidance) using agamid lizards. Finally, I outline the likely relevance of sleep ecology as an evolutionary driver, its application to conservation, and other interesting research directions.