When you're in a daze - whether it's from running or a hangover or whatever else - I think that ideas from your subconscious can slip through more easily. The way that I write songs, for what its worth, when I'm playing music, if it's good music it will bring images forward into my mind and then I'll write down what the images are and that becomes the lyrics. I think that process is just easier if the superego has just gone away in disgust for the day.