In just five short lines, the speaker describes how powerfully another person's voice affects them. The voice doesn't simply please or soothe; it "commands" goosebumps, as if it had authority over the speaker's body. The skin reacts before the mind has any say, which suggests a love or longing that is physical and almost out of the speaker's control.
The words "every night" give the feeling a rhythm. This isn't a one-time thrill but something that returns again and again, perhaps in the quiet of bedtime, when the voice might be heard in person, over the phone, or only in memory. The poem doesn't tell us which, and that openness is part of its charm. The closing dash leaves the thought hanging, as though the speaker is still caught in the sensation and can't quite finish.
The mood is intimate, hushed, and a little breathless. It captures how one person's voice can feel more powerful than any touch.