Night is the problem here. Every time the speaker lies down, a face appears in the dark, and even when it doesn't, there is the feeling of breath on the back of the neck. The speaker is talking directly to a father, someone they "once loved," and the phrase "once loved" tells us how much has changed. The poem suggests that something this person did has damaged the speaker's trust, though it never says what.
The feeling that runs through it is exhaustion mixed with anger. The speaker accuses the father of destroying their sleep and their life, then asks, "Haven't you done enough," which sounds worn out and fed up. The repetition of "haunt," "dreams" and "lurking" makes the poem feel stuck in a loop, much like a nightmare that keeps returning. The language is plain and unpolished, which makes it feel raw and honest. The mood is tense, fearful and sad, with a sense that the speaker cannot escape even when they are asleep.