In the poem " After Apple Picking" by Robert Frost, the author gives great prominence to the ladder he uses to reach the apples that are growing on the very top of the apple trees in his orchard. He mentions it several times, even mentioning that he has been laboring so long on it that the rungs have dug into the soles of his feet. For many authors, the theme of self-advancement and aspiration, or working hard to advance a career or art such as poetry, was central. In this poem Robert Frost tells how hard that labor is, how physically exhausting and even emotionally draining (he even undergoes it all again in his dreams.) In "Stopping by Woods on a Snowy Evening" however, it is the snow which is relaxing, comforting , consoling as it softens hardships, and blots out ugliness such as pain or stress.
sleep is a symbol for death, apple-picking is a symbol for life and missing out on things, woods are a symbol for mystery/unknown