It's also the fact that you're in a new sleeping enviroment. People tend not to sleep well in novel environments, called the 'first night effect', until they become comfortable to their new surroundings. So even if the athletes did custom-tailor their sleeping situation to be just like at home, ti still probably won't be good enough to give them a home-field level of sleep quality.

https://www.cell.com/current-biology/fulltext/S0960-9822(16)...