Three short lines place us in a tent in the woods, awake when we'd rather be asleep. The title, "Sleepless," gives the reason for the quiet attention that follows: with nothing to do in the dark, the speaker and their companions simply listen.
The word "we" matters. Nobody is alone here, and the listening feels shared, almost like a small ritual. The phrase "everything new" suggests that the night sounds are unfamiliar, perhaps rustles, drips, or distant calls the speaker wouldn't notice in daylight or at home. Nothing in the poem says they are afraid. Judging by the wording, the feeling is closer to curiosity, even a quiet pleasure in being so alert.
The mood is hushed and intimate. The poem is so brief that it leaves plenty of silence around the words, much like the dark around a tent. Sleeplessness, usually a nuisance, becomes a way of noticing the world more closely.