Sleep silent angel, I'm a weirdo

I was asking on of my work colleagues if she likes Radiohead (the band) yesterday. I'm not all that familiar with Radiohead and don't own any of their albums, but people I know do and I'm still killing Mumford and Sons, so I thought I'd explore. Today she brought in two of their CDs for me to listen to, but they're older ones (My Iron Lung and OK Computer). We were chatting this morning and another colleague who overheard said "oh, you'll be slitting your wrists later on" and I can see what she means - I do like melancholy, but there's a certain wailing going on here. Anyway, I was listening to the song Creep, and as often happens a fragment of music reminds me of some other fragment of music, and particularly when he gets to the part "she's running out ...", I keep hearing the line "sleep silent angel, go to sleep". It's from that really old song The Air that I Breathe (I had to google it to even place the line) by I don't know who. So the depths of my brain music archive have dug that up from somewhere ...