Stick a fiberoptic scope down and see. BTW it isn't always cord adduction or light anesthesia.
Thanks for this thread. It was the last thing I read before I went to bed last night... then I ended up dreaming that my patient was actually talking to me with an LMA in (not hooked up to the vent of course). Thanks for the entertainment.
This happened to me the other day and I couldn't figure out what it was. All of my indicators (BP, HR, BIS, breathing rate) told me that the patient wasn't light, and like previously said I gave a little CPAP and it went away.