A new study demonstrates how alcohol causes you to focus on a goal’s desirability rather than its feasibility. For instance:
[W]hen sober, people often avoid the low-feasibility high-desirability situation of successfully finding a new romantic partner because they focus on the likely (and feasible) cost of a depleted ego and not on the unlikely but highly desirable benefits of a lifetime of romantic happiness. Generally the expected value of these benefits still outweighs the expected costs, but it is only when alcohol creates a focus on desirability that people realize this.
The Dish 