In the middle of winter, the speaker wants something small and clean: silver, and a true sail. Both images suggest light and movement, a way out of the cold and dark. The wish is quiet rather than grand, and it hints at a longing to be carried somewhere honest.
Then the poem turns inward. Writing "a history of midnight" sounds like the speaker is recording sleepless nights, or the dark hours when thoughts press hardest. Saying "I am making myself see" suggests this isn't easy. It takes effort and a kind of discipline.
What the speaker is forcing themselves to see is the gap between "take" and "care." The title, "Caretaker," holds both words, and the ending pulls them apart. To look after something is not the same as simply taking it, using it, or holding on to it. The mood is hushed, wintry and reflective, with a thread of hard-won honesty running through it.