I do this. It's comforting to know there is final escape key to life. I also write notes without intention. If I had more intention, I'd never leave a note because I don't want to make it that easy to my parents. I don't want them knowing anything about me. Writing notes actually reminds me why I need to keep holding on to life because I address them to my friends and I can't ever write anything that justifies putting the tears I imagine in their eyes while writing it.