Intertemporal Model Macroeconomics
You just have to write down some utility function that changes in each period, in the first there should be an additional term (shock) a constant multiplicative on the disutility of work that reduces it, and then in the second period this constant becomes one. 
A dynamic model solution is a vector of $(l^*_1,l^*_2)$ of the equilibrium hours of work that the consumer chooses according to her preferences, and restrictions.