It's there - just at the veil of sleep. That dull sensation of falling or spinning just before you fall to sleep. The next time you go to bed, try to hold yourself there. Just as you drift off, hold onto that feeling. Hold on, and listen. Listen close, for you cannot hold onto that edge of sleep for long. There, in the space before sleep, is a sound: a gentle hum, a distant echo; like a sigh in a brick building. Listen well, and remember that sound. That is the sound of your last breath.