My sister remarked that I seem quieter than usual on this trip. I agree with her. But it's hard to come up with a clear explanation. The coughing fits I've had the last two nights, triggered by heavy doses of campfire smoke, are surely part of the reason. All day I've felt like a person suffering from oxygen deficiency. It's more than that, though. I'm averse to casual conversation somehow. And I don't want to speak just to fill up the space where silence would otherwise rule.