Fear of the light or need for action: the IGL will judge

Temporal adaptation of behaviors is of crucial importance for every organism. In this issue of Neuron, while elegantly establishing the developmental program of the subcortical visual shell (SVS), a group of retinorecipient nuclei, Delogu et al. (2012) also implicate one of its structures, the IGL, as a potential important player in the regulation of daily activity pattern.