"Goin' out of My Head"

This morning I was thinking about "Goin' out of My Head," specifically the "Day and night / Night and day and night" lines near the end.  I realized that this is a rhetorical effect called merism - naming the beginning and end of something in order to refer to the entirety.  With "day and night," the sense is actually "all the time."  Because it's repeated and reversed in "Goin' out of My Head" ("Day and night / Night and day and night"), there's an even greater sense of this duration.