C172 INSTRUCTOR AND TRAINEE BOTH EXPERIENCED FAINTNESS AND NAUSEA. PLTS FELT AS THOUGH THEY MAY PASS OUT. ATC GAVE EMER HANDLING FOR LNDG.

Narrative

THE STUDENT AND I WERE RESTED AND RELAXED. WE FILED AN IFR FLT PLAN FROM TEB TO SWF BACK TO TEB WITH THE INTENTION OF SHOOTING THE ILS 9 (SWF) AND ILS 6 (TEB). WE WERE PREPARING THE STUDENT FOR HIS INST CHK RIDE. BOTH THE STUDENT AND I HAD BEEN IN ACTUAL CONDITIONS WITHIN THE LAST MONTH. FURTHERMORE; I HAD LOGGED APPROX 10 HRS ACTUAL NIGHT WITHIN THE LAST MONTH. AS WE WERE CLBING UP TO 4000 FT; WE SHUT OFF THE STROBES AND THE LNDG LIGHT TO REDUCE ANY POSSIBLE DISORIENTATION. WHILE IN A STRAIGHT CLB; I BEGAN TO FEEL FAINT; AS IF I WAS GOING TO PASS OUT. I QUERIED THE STUDENT AND HE IMMEDIATELY REPLIED HE FELT VERY BAD; AS IF HE WAS GOING TO PASS OUT. WE IMMEDIATELY REQUESTED PRIORITY LNDG BACK INTO TEB. WE WERE GIVEN VECTORS TO A L BASE FOR RWY 6. WE WERE CLRED TO DSND TO 700-800 FT WHERE WE WENT VISUAL AND LANDED SAFELY. WE BOTH RECEIVED OXYGEN ON THE GND AS WE BOTH FELT FAINT AND HAD HEADACHES. WE BELIEVED WE MIGHT HAVE EXPERIENCED CARBON MONOXIDE POISONING; EVEN THOUGH THE HEATER WAS NOT ON. WE FOUND THAT IN THE CLOUDS WITH THE WINDOWS AND VENTS FULLY OPEN THE TEMP DROPPED CONSIDERABLY CAUSING A PRONOUNCED SHIVERING FOR BOTH THE STUDENT AND MYSELF WHICH HAMPERED OUR ABILITY TO FUNCTION. THE PLANE WAS GNDED AND INSPECTED; HOWEVER; NO OBVIOUS CAUSE COULD BE FOUND.