Yamato is still mostly asleep when those gusts of wind arrive, but he's a light sleeper, and he jerks awake sharply as Barry arrives with the second gust. There's a momentary look on his face of somewhere between disorientation and alarm, and his digivice has been pulled off his belt and into his hand before he's even completely straightened up.

It takes a few more seconds, during which time he looks very much like he expects a giant monster attack at any second, but he does relax after a moment, as he groggily realises where he is and that the wind was just Barry.

"I usually get everyone up at five when we're on a mission, 'cept Jyou and Hikari," he supplies, helpfully, if not also somewhat groggily. "Ugh. Thank you for bringing coffee."

He's guessing that he was more tired than he thought he was, because after a little bit of sleep he just feels like his head is full of cotton fluff.