Sleeping man on the tube who liked my book

Got on the tube home the other night with 'Sketch Your World' by James Hobbs in my hand and the elderly chap sitting opposite me tapped me and showed me the graphic novel he was reading – looked pretty cool, he was clearly a drawing fan... As the journey went on he nodded off, and as standing passengers cleared I suddenly thought 'I should draw him!' so I pulled out my sketchbook and hurriedly sketched him in the final 5 minutes of my journey with the intention of showing him before I got off. He was still asleep at my stop so I left him to it, if I see him again I will show it to him!