The dreamer hopes to "measure" his life in a specific way, perhaps feeling the need to consider how he should act in order to not let others down, and to think about the role he plays in the lives of others.
Dreaming of using a ruler to measure an object indicates that the dreamer hopes to organize his life in an orderly manner.
Dreaming of a rolled-up ruler forming a tight bundle that is difficult to unroll signifies extremely strict constraints.
THE END
