Three short lines, and almost everything in them is left unsaid. We get a time, 3:05 a.m., and then a quiet instruction: keep on reading. That's it. But the details do a lot of work. Three in the morning is when most people are asleep, so whoever is awake is probably alone, restless, or unable to switch off.
It's unclear who is speaking. The words could be the speaker talking to themselves, nudging themselves to keep going instead of giving in to the night. They could also be an encouragement to us, the reader, who is also here, still reading. Either way, the tone feels hushed and intimate, like a whisper in an empty house.
The mood is a mix of loneliness and comfort. The hour is isolating, yet reading offers company and something to hold onto. The poem's brevity mirrors the stillness of the hour: there's nothing to add, so it simply stops.