I concur with those who said this song is about a drug addiction. Furthermore, the title itself offers a clue to this. When you do drugs you get "high", so it seems logical that when you "come back down" it means you are getting down from that high.
This doesn't necessarily mean Glen or anyone in the band had a drug problem, though. It could be about someone they know, or just something they decided to write about for whatever reason.
I concur with those who said this song is about a drug addiction. Furthermore, the title itself offers a clue to this. When you do drugs you get "high", so it seems logical that when you "come back down" it means you are getting down from that high.
This doesn't necessarily mean Glen or anyone in the band had a drug problem, though. It could be about someone they know, or just something they decided to write about for whatever reason.