Sheep can graze for about six to eight hours a day, according to Google. And it turns out, I can happily spend a good 60 minutes or so watching them; there's something quite hypnotic in that steady rhythm of rip, munch, chew. I've just spent the night in a shepherds' hut on Romney Marsh - a 100-square-mile stretch of marsh and farmland declared an 'Area of Outstanding Natural Beauty', tucked between the Kent Downs and Sussex border on England's south coast. Alarm set for sunrise, I'd planned to head out for an early bike ride, but opening my blinds to a heavy fog, it's a slow morning instead.