"...yeah. Would not want to be working a serious job up there. You need kinda normal sleep to stay sharp."

Does that mean Jake gets kinda normal sleep? Well...the minimum enforced by the train, at least.

"No, there are animals. Underwater animals aren't affected as much, so you've got plenty of fish. Basically any animal that can eat those can survive...so you get big white polar bears, forxes...they need thick fur to stay warm too. The humans eat fish and have fake fur."