He overworked himself and he's napping it off. No big deal, it happens.

( julian was out for weeks, once. days after several other occasions. foley's put himself into comas before - not intentional, but it's a thing that just happens sometimes. julian doesn't look too worried as he adjusts nate's weight in his arms, and starts walking him up to the door of the iguanas' cabin. )

Give him a day or so and he'll be back up. Probably. If not, Sophie or Quire can kickstart him.