GA SMA ON A TRAINING FLT LANDED AT 8W5 AFTER ARPT WAS CLOSED.

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BEFORE SETTING OUT ON AN INST TRAINING FLT THE STUDENT AND I CHKED WITH FSS SEVERAL TIMES CONCERNING THE WX; FORECASTS; SIGMETS; AND NOTAMS FOR OUR PROPOSED FLT. AFTER CHKING BOTH THE AOPA ARPT DIRECTORY AND THE NOS APCH PLATES WE FILED OUR FLT PLAN; AND SET OUT ON THE FLT. AFTER REACHING OUR DEST WE WERE CLRED AND SHOT THE ADF APCH; THOUGH WE WERE IN VFR CONDITIONS; AND FOUND THE ARPT. AFTER SIGHTING THE ARPT WE LANDED SAFETY AND TAXIED TO THE RAMP. ON THE RAMP WE WERE APCHED BY THE LCL AUTHORITIES WHO INFORMED US THAT THE ARPT CLOSES AT SUNSET. WE PROMPTLY LOOKED THROUGH THE NOS APCH PLATES AND THE AOPA DIRECTORY. THE DIRECTORY LISTED HOURS OF THE ARPT AS 'UNATTENDED' BUT NO MENTION OF CLOSURE. THE NOS APCH PLATE LISTED IN THE NOTES SECTION AT THE BOTTOM THAT THE ADF 'APCH PROC IS NOT AUTH AT NIGHT.' THIS BRINGS UP SEVERAL QUESTIONS AS WELL AS PROBABLY SOME NEEDED CHANGES. THE NOTAMS WHICH INCLUDE THE SUNSET CLOSURE AT BILLY MITCHELL ARE LISTED IN THE LCL NOTAMS AND WE NEVER RECEIVED SUCH A NOTAM ON OUR PREFLT BRIEFINGS. THERE MUST BE SOME WAY OF CONVENIENTLY RECEIVING ALL NOTAMS FOR A PARTICULAR FLT? I HAVE LEARNED NOW TO USE MORE THAN ONE OR TWO SOURCES OF ARPT DIRECTORY FOR THEY MAY NOT CONTAIN CURRENT AND UP TO DATE INFO. HOWEVER; THE HOURS OF THE ARPT AT BILLY MITCHELL FIELD IN THE AOPA DIRECTORY SHOULD BE CHANGED FROM 'UNATTENDED' TO 'SUNRISE TO SUNSET.' MORE OF A QUESTION IS; WHY DID ATC CLR US FOR THE ADF APCH AT HATTERAS IF SUCH A PROC IS UNAUTH AT NIGHT? IF AN IFR PROC SUCH AS AN APCH IS NOT AUTH; FOR SOME REASON; THERE SHOULD BE SOME STANDARDIZATION ON LISTING THIS ON THE PLATE. I HAVE SEEN MOST OF THESE LISTED IN ALL DIFFERENT LOCATIONS; AND SOME ARE HARD TO FIND.