Lesku, J. A., Bark, R. J., Martinez-Gonzalez, M. D., Rattenborg, N. C., Amlaner, C. J., & Lima, S. L. (2008). Predator-induced plasticity in sleep architecture in wild-caught Norway rats (Rattus norvegicus). Behavioural Brain Research, 189(2), 298-305. doi:10.1016/j.bbr.2008.01.006.