Night, in these few lines, is a place where we can finally be honest. The speaker describes unsaid thoughts and painful words that build up inside us until they leak out as "sour little drops." The image is quietly physical: the drops stain the bed sheet, first in small circles, then in pools. It reads like crying, though the poem never names it. Whatever we swallow during the day seems to spill over once we lie down in the dark.
The key idea is that the night "doesn't judge." No one is watching, no one is waiting for an answer, so the hurt can come out without shame. The closing line, set apart with a dash, feels like a soft realization: maybe that is why so many people love the night. The mood is tender, lonely, and a little weary, but also comforting. The speaker seems to find a kind of relief in the darkness, as if it were the one listener that accepts everything we couldn't say aloud.