What relaxes you enough to sleep?

I like the way you compare with a fine tuned auto - I see sleek, shiny and very daring. I am usually so tired from a full day that it takes but a few pages from a book and my eyes are heavy. I have to be careful now days or I hear my dreams before I'm completely asleep - it's eerie and will startle me awake. I need to stop reading before I start losing consciousness and then it won't happen.