TRACON APPROVED AND GAVE ASR APCH TO 2M6; WALLS ARPT; MS; AT NIGHT CONTRARY TO CHART NOTED RESTRICTION AFTER ASSURING PLT THERE WAS NO NIGHT RESTRICTION FOR THE APCH.

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I WAS AT M83; W POINT; MS; AND WANTED TO GO TO 2M6 IFR. I FILED A FLT PLAN TO MEM; 12 1/2 MI NE OF 2M6 BECAUSE I THOUGHT I COULDN'T GET AN ASR APCH TO 2M6 AT NIGHT CEILING WAS 900 FT AND THE VISIBILITY WAS 8 MI. ON THE GND AT MEM; I DECIDED TO FILE IFR TO THE W MEMPHIS ARPT; SHOOT THE NDB APCH; CANCEL IFR AND CONTINUE TO 2M6 (10 MI) VFR. AIRLINE TFC WAS VERY HVY AND I CALLED MEMPHIS TRACON TO FIND OUT WHEN THE TFC WOULD SLOW DOWN. I HAD PLENTY OF TIME AND DID NOT WANT TO CAUSE THEM INCONVENIENCE. TRACON SAID THAT AFTER PM THE RUSH WOULD BE OVER. I TOLD HIM OF MY PLAN AND ASKED HIM WHY I COULDN'T DO THE ASR AT 2M6 AT NIGHT. HE SAID THAT THERE WAS NO REASON WHY I COULDN'T. I TOLD HIM ABOUT MY EXPERIENCE EARLIER AND HE ASKED ME TO HOLD ON A MIN. HE CAME BACK ON THE LINE AND SAID; 'YOU CAN DO THE ASR APCH TO 2M6 AT NIGHT; NO PROBLEM.' I SAID GREAT; CALLED FSS; FILED AN IFR FLT PLAN MEM DIRECT 2M6 VIA RADAR VECTORS. I WAS CLRED AS FILED AND VECTORED TO A PERFECT APCH. I CALLED MY FLT INSTRUCTOR WHEN I GOT HOME AND TOLD HER ABOUT MY FLT. SHE TOLD ME THAT YOU CAN'T DO AN ASR APCH TO 2M6 AT NIGHT. SHE IS RIGHT. I FAILED TO LOOK UP THE RADAR APCH MINS WHICH STATE; 'PROC NOT AUTHORIZED AT NIGHT.' I WAS TAUGHT TO DO THIS WHILE TRAINING; BUT I THOUGHT I KNEW EVERYTHING ABOUT THE MINS AT 2M6. ON ANY OTHER TYPE OF APCH I WOULD HAVE HAD AN APCH PLATE IN FRONT OF ME. I WOULD HAVE LOOKED UP THE RADAR APCH MINS AT AN UNFAMILIAR ARPT; BUT I HAD LOOKED AT THE 2M6 MINS SO MANY TIMES THAT I THOUGHT I KNEW THEM WELL. WHEN TRACON TOLD ME THAT IT WAS OK TO DO THE APCH AT NIGHT; I THOUGHT THAT THERE HAD BEEN SOME MISTAKE PREVIOUSLY SOME MISUNDERSTANDING ON MY PART.