Aidan Nelson's "Sleepless Nights" is about being worn down by nightmares that won't stop. The speaker is exhausted from restless nights and the fears that follow them, and the poem puts that tiredness right up front: "I tire of the dreams."
What the speaker sees is brutal. Family members die, friends look on in frozen horror, and the speaker dies too, "at the hands of everyone I know." That last detail suggests the nightmares are not only about loss but also about betrayal or being hated by the people closest to them. The repeated line "I die again and again" captures how helpless the speaker feels.
The mood is bleak and weary, with a sense of being stuck. The short, plain lines add to this. The ending is quiet rather than dramatic: the speaker asks for "salvation" and only hopes the dreams "might" go away, which leaves the poem with a fragile, uncertain trace of hope.