you would Sleep because Dream. Sleep is the opposite of Wake. Wake is a type of Reception. 
Lot is a synonym of Crew. Crew is related to People. Migration is a type of People. 
Dream <--MotivatedByGoal-- Sleep <--Antonym--> Wake --IsA--> Reception 
Lot <--Synonym--> Crew <--RelatedTo--> People <--IsA-- Migration 