They walked. Bitterroot glanced back at Gale. In spite of keeping watch all night, Gale’s behavior wasn’t any different. Bitterroot had once heard that too little sleep could kill you. She’d also heard of a stallion (she couldn’t remember his name) who claimed to have gone without sleep for years. And she knew that certain animals — some breeds of shrew, for starters — didn’t sleep at all. Sleep was one of those weird things neither science nor magic had been able to figure out yet. Maybe there was more to the “wing paralysis” story that Artemis let on — or Gale was letting on to Artemis.