As I walked along the road at the end of a long week of work I was fighting back the tiredness. My friends and I were looking forward to a few drinks but I'd had a late night the night before, so was planning just to have a couple and then head home. “Why were you up so late?” my friend asked. “Just couldn’t get to sleep,” I replied, trying to hide the smile that crept across my face. We went to our usual drinking establi...