Samantha Harper's poem describes a mood that sits somewhere between sadness and calm. The speaker calls it "blue-ish," a word that keeps the feeling vague and gentle rather than overwhelming. She says she is lost but not hopeless, and she compares the mood to drowning in your own ocean while staying strangely calm, too tired to swim.
What stands out is how soft the sadness is. It "caresses your heart with numb fingers," and the image of a mother singing a lullaby with tears in her eyes holds comfort and grief together. The speaker even admits she would rather feel this than nothing at all, though she knows that comfort is a little unhealthy.
Blue is not only sad, though. It is also the color of happy skies, and the last couplet asks the reader to excuse her mood, because for her it feels like "a long deserved rest." The tone is quiet, honest, and oddly peaceful.