A319 FO BECOMES UNRESPONSIVE WHILE CLIMBING THROUGH FL180. CAPT TAKES CONTROL AND IS ABLE TO REVIVE FO AND CONTINUE TO DESTINATION.

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OUR TRIP STARTED NORMALLY WITH AN XA00 MORNING DEP FROM THE LAYOVER HOTEL. I WAS WELL RESTED; HAVING GOTTEN OVER 8 HRS OF GOOD SLEEP. I HAD A LIGHT BREAKFAST BEFORE LEAVING THE HOTEL. UPON ARR AT THE ARPT; THE CAPT AND I PROCEEDED TO OPS AND DID OUR FLT PLANNING. THIS PROCEEDED NORMALLY; THE WX BEING GOOD AT BOTH DEP AND ARR ARPTS. WE THEN WENT TO THE ACFT AND ACCOMPLISHED OUR PREFLT; PUSHBACK; AND TKOF SOP'S NORMALLY. IT WAS MY TURN TO FLY THE LEG TO ZZZ SO I BRIEFED THE CAPT ACCORDINGLY. IT WAS A NORMAL TKOF AND CLB PROFILE. I WAS HAND FLYING THE ACFT; PLANNING TO ENGAGE THE AUTOPLT PASSING THROUGH FL180. SOMETIME AFTER PASSING THROUGH 10000 FT; I REMEMBER FEELING A LITTLE LIGHTHEADED. I APPARENTLY BECAME UNRESPONSIVE FOR A SHORT PERIOD; DURING WHICH TIME I WAS MAINTAINING A SIDE STICK INPUT. THE CAPT NOTICED THE UNUSUAL ROLL COMMAND; MY UNRESPONSIVE CONDITION; AND TOOK PRIORITY WITH HIS SIDE STICK. SOON THEREAFTER; I BECAME RESPONSIVE AND FELT NORMAL; THOUGH FEELING DISTURBED ABOUT WHAT HAD JUST TRANSPIRED. THE CAPT STARTED TALKING TO ME; ASKING HOW I FELT. AFTER TELLING HIM I FELT OK TO CONTINUE TO ZZZ; HE DETERMINED THAT WOULD BE A SAFE COURSE OF ACTION. HE THEN BRIEFED THE FIRST FLT ATTENDANT. THE REST OF THE TRIP SEGMENT PROCEEDED NORMALLY; WITH CAPT AS PF. IN THE INTEREST OF SAFETY; THE CAPT HAD THE FIRST FLT ATTENDANT RIDE IN THE COCKPIT JUMPSEAT FOR DSCNT AND LNDG; WHICH WERE NORMAL. AFTER BLOCKING IN AT ZZZ; I PUT MYSELF ON SICK LIST. I IMMEDIATELY CALLED THE UNION AEROMEDICAL OFFICE. I WAS ADVISED TO SEEK MEDICAL ATTN; WHICH IS WHAT I DID. SUPPLEMENTAL INFO FROM ACN 787045: APCHING FL180 IN A CLB TO FL230 WITH THE FO HAND FLYING THE ACFT; I BRIEFLY LOOKED DOWN INTO MY FLT BAG AND FELT THE ACFT ROLL L. I WAS NOT EXPECTING THIS ROLL AND IT CONTINUED TO INCREASE IN ANGLE OF BANK SUCH THAT I THOUGHT WE HAD A SIDE STICK FAILURE. I TOOK PRIORITY AND ANNOUNCED MY INTENTIONS TO THE FO. WHEN I LOOKED OVER AT HIM I SAW HE WAS NOT RESPONDING TO ME. I STABILIZED THE ACFT FLT PATH AND ATTEMPTED TO GET THE FO'S ATTN THROUGH LOUD VERBAL COMMANDS AND PHYSICAL JOSTLING OF HIS ARM AND SHOULDER. AFTER ABOUT 10-20 SECONDS; HE REMOVED HIS HAND FROM THE STICK AND PLACED IT IN HIS LAP; AS I REQUESTED. HE THEN SLOWLY BECAME COMMUNICATIVE AND SAID HE FELT LIGHTHEADED. I GAVE HIM HIS CREW BREAKFAST AND HE PUT ON HIS OXYGEN MASK FOR A BRIEF TIME. THE FO RECOVERED WELL ENOUGH TO PERFORM PNF DUTIES NORMALLY AND HE APPEARED TO BE FULLY ALERT. WE DETERMINED THAT PROCEEDING TO ZZZ WAS A SAFE COURSE OF ACTION. I BRIEFED THE FIRST FLT ATTENDANT ON THE SITUATION AND ELECTED TO HAVE HER SIT ON THE COCKPIT JUMPSEAT DURING APCH AND LNDG FOR OBSERVATION/MONITORING AND SAFETY PURPOSES.