At 1pm every afternoon, the hustle and bustle of Real Madrid's Valdebebas training ground grinds to a halt and the facility resembles a ghost town.
A silence descends over the complex for the following two hours as players and staff close their eyes and drift into a siesta before waking and resuming their day - but they're not sleeping on the job.
The scene is a window into football's relentless pursuit of marginal gains as clubs across Europe turn to technology, purpose-built facilities and sleep experts to recharge their multi-million pound assets and gain a competitive advantage.