AN ACR B767 FLC FAILED TO OBTAIN LNDG CLRNC AT SDF.

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CAPT AND FO WERE CALLED AT APPROX XA10 AND ACCEPTED ASSIGNMENT TO RPT AT XK00. CAPT SLEPT 3 HRS 45 MINS PRIOR TO RPTING. FO SAID HE SLEPT 'A COUPLE HRS.' UPON ARR AT OPS; CREW WAS ASSIGNED A TURN TO EFD AND BACK TO SDF. ARR AT SDF WAS SCHEDULED AT XQ53. THE FLT TO EFD WAS REDISPATCHED TO IAH PRIOR TO DEP DUE TO LOW VISIBILITY AT EFD. ENRTE TO IAH; FLT CTLR SENT MESSAGE TO CREW; VIA ACARS; REQUESTING DIVERSION TO EFD. CREW AGREED AND LANDED EFD. ON RETURN FLT; FO SHOWED SIGNS OF FATIGUE. CAPT WAS A LITTLE TIRED; BUT PERFORMING DUTIES OK. ON APCH TO SDF; FLT WAS CLRED FOR ILS RWY 35L. JUST OUTSIDE FAF; WITH CAPT FLYING; APCH CTL HANDED FLT OFF TO TWR. CAPT WAS SLOWING ACFT AND CALLING FOR CONFIGN TO LAND. FO CALLED TWR; CAPT HEARD FO CALL TWR AND THOUGHT HE HEARD LNDG CLRNC; BUT APPARENTLY DID NOT. CAPT TURNED ON LIGHTS ON NOSE GEAR; WHICH IS HIS HABIT UPON RECEIVING LNDG CLRNC. CAPT SAID; 'CLRED TO LAND.' FO SAID; 'CLRED TO LAND?' CAPT SAID; 'YES.' UPON LNDG; CAPT SAW THAT TWR FREQ WAS NOT SET. TWR SAID TO CHK RADIOS. THE FO HAD SET THE WRONG FREQ; CALLED TWR; BUT DID NOT RECEIVE CLRNC TO LAND. CAPT WAS DISTR AND THOUGHT HE HEARD LNDG CLRNC; BUT APPARENTLY DID NOT. LNDG WAS UNEVENTFUL. CREW SHOULD HAVE PAID MORE ATTN TO FO QUESTION. CREW HAD CRM DISCUSSION AFTER FLT. CREW NEEDED MORE SLEEP.