A speaker looks up at a huge night sky full of stars and feels small enough to vanish. The "ocean of blushing bulbs" is a lovely image: the stars become glowing lights, almost shy, spread across a dark sea. Instead of feeling comforted, the speaker says "I think I'll disappear," which hints at awe mixed with uncertainty.
That uncertainty turns into a question about the future. Is it "black as the sky," empty and unknown, or "limitless and high," full of possibility? The poem doesn't answer, and that open question gives the middle a restless, dreamy feel.
Then the focus shifts to another person. Sunshine and morning don't excite the speaker; "you" does. It's this person who says "wake up," and the words could mean literally getting out of bed or being pulled out of drifting thoughts. The mood ends quietly warm: a lonely, wondering night softened by someone who matters.