you would Sleep because Dream. Dream is related to Interpretation. 
Emotion is part of Mind. Worry is a type of Mind. Person does not want (to) Worry. Spanish is a type of Person. 
Sleep --MotivatedByGoal--> Dream <--RelatedTo--> Interpretation 
Emotion --PartOf--> Mind <--IsA-- Worry <--NotDesires-- Person <--IsA-- Spanish 