I secretly wish it were socially acceptable to lay my head on the shoulder of my fellow subway passengers. Sometimes the work days are long and when I finally sit down on the subway ride home I just need to lean my head and shut my eyes. Usually the shoulder of the older, taller man who reminds me of a Dad looks rather appealing.
I imagine the request would go something like this, "Good Sir reading your Kindle, would it bother you if I borrowed your shoulder to rest my weary head. I find it a convenient height and imagine it would not interrupt your reading. Just wake me when it's your stop. Thank you."