runners. But whether you run a 2:30 or a 4:30 marathon, you too should up your sleeping game, says Professor Jim Horne from the Sleep Research Centre at Loughborough University. "Consistent, regular, good-quality sleep is vital when training for any
, and your brain, being a hugely inefficient and sizeable organ, can use up to 10 per cent of your stored glycogen energy reserves before you've even begun – you'll see the elite runners take time away from the crowds to keep calm and maintain their pulse
