  Much work has been done to investigate social jetlag, a misalignment between
the biological clock and the social agenda caused by exposition to different
light inputs, that causes several health issues. To investigate synchronization
and attractors due to a sequence of light inputs, we introduce an extension of
a model, previously used to describe jetlag caused by a single change in the
light input. The synchronization to the light input is sensitive to the control
parameters of the system and to the light input periods. Depending on the
parameter set, the observed synchronization is with one or another successive
light input. Most of the solutions have the period of a light input. However,
for some parameters, we also observed higher period, chaotic solutions, and
bistability.
