When in bed, I take a mental walk. A few nights ago, I wandered through a cornfield at dusk. When you don't know where you're going, it's easier for instinct rather than intellect to take over and thus you more quickly enter a dream state. Granted this sometimes only works for a couple of minutes as the subtlest things can stir me. But I simply try again.

When nothing else works, I take a bendryl.