It could be the calmness that he wasn't used to, the sudden silence, the soft wind blowing into the tent and overall, the peace that was strange to him and as such woke Mordeu up from his sleep.
The silence was not something he was acquainted with. Back at home, he lived in the most wretched town and before the sun rose to the sky, there were already people going about doing their business. The noise they made and the noise from his own mother were the things that woke him up then. And now, coming to the training grounds, there was a bell waking them up every morning as the sun set out its head.
It was not the same here, and the strangeness was quite unsettling for him. So unsettling that he immediately sprinted to his feet and ran outside to clarify that he had not been, somehow, teleported into another realm.
Well, he hadn't been.