Hotel really is bad. Lay down to go to sleep and started coughing and felt almost like I was having trouble breathing -- feels like from the dust, and I'm not someone who is sensitive to dust. I'd say I'm less sensitive than average if anything. Running the A/C unit on fan-only (effectively) constantly has I think made it a tiny bit better, though not a great deal (and it made it worse if anything when first turned on).
Also, first time since 2001 (Beijing -- or maybe Shanghai, but I think the hotel in Shanghai did better) that I've had synthetic bed sheets. Yuck.