Our Nepali sirdar (expedition team leader and guide) moved quietly from tent to tent, waking us in turn. In the cold pre-dawn darkness we dressed quickly and followed him up to a small plateau above the town of Namche Bazaar, 3,500 metres (11.500 feet) above sea level in Nepal’s Khumbu Valley. There we stood as the sky lightened slowly until, finally, a golden glow illuminated the summit of Mount Everest (Chomolungma in Nepalese), topped with a halo of cloud, jutting coyly above the massive Lhotse-Nuptse mountain wall, 28 kilometres away. After some time utterly absorbed in the moment I turned to thank our Nepali friend but no words came. Choking back unexpected tears, all I could manage was a soundlessly mouthed “thank you”.