Usually, the people I draw are upright. The man at the table next to me must have been really tired. His head was supported by his folded arms and he was snoring away. He seemed quite cozy.
The drawing immediately below is a blind drawing, done while looking at the man and not the paper. However, I cross hatched the dark areas while looking at the paper. The mass of the subject’s body is compact and self contained. Therefore the chances of misplacing the pen point on an outstretched arm or leg or forehead, are minimized.
I did the drawing below in the usual way: making a mark, looking at the results, making another mark based on the visual feedback.