"In the day nothing matters, It's the night time that flatters". This spirit that I will talk about only attacks at night. (one time I think it did attack in the day, but that was the only time)
"In the night, no control, Through the wall something's breaking". About the 10th year of satans war with me, one night when I was about to sleep, I suddenly felt a spirit ( I call it the "laughing" spirit because in my case it felt very much like it was going to make me laugh or crack a smile against my will ). It was trying to break through mine. I prayed very hard and fought it with all I had. I soon found I was stronger when I lie on my stomach, and most vulnerable lying on my back, so I lay on my stomach and after some hours fell asleep. Also pacing around helps a lot. It did try attacking again many times in the remaining 7 years of the war, but was never as strong as the first night. I always dreaded what would happen if it did break through, but never found out as I was always able to keep it at bay (not easy at all). There were moments when I was not sure anymore if I was smiling and had to check the mirror to verify I still had a straight face. After it happened a few times, I started to remember this lyric in this song, and thought that is probably what they are talking about.
"Wearing white as you're walkin', Down the street of my soul", Not sure what "wearing white" means but this is obviously some sort of possession by another spirit - likely satan.
"I, I live among the creatures of the night". The word "creature" used means she is no longer human, now a "thing" as someone under satans power.