COMMUTER HAS ALTDEV AND GIVES WRONG ATIS IDENT DUE TO FATIGUE.

Narrative

ON DSCNT TO CHARLESTON; WV; ZID HANDED US OFF TO CRW APCH. ON INITIAL CONTACT WITH APCH; I STATED OUR ALT (11000 FT) AND THAT WE HAD ATIS INFO. THE CTLR GAVE US A DSCNT TO 8000 FT WHICH I READ BACK ALONG WITH A CHANGE IN ASSIGNED HDG. DURING THE READBACK I REALIZED I HAD STATED THE ATL DEP ATIS WHICH WAS WRITTEN ON THE WT AND BAL FORM. I FOUND THE CORRECT ATIS INFO CODE AND ADVISED APCH THAT WE HAD THAT INFO INSTEAD. MEANWHILE; THE CAPT SET THE ALT ALERTER TO 3000 FT INSTEAD OF 8000 FT. AFTER FUMBLING WITH THE PAPER WORK I CONFIRMED THE INCORRECT ALT. THE CTLR QUESTIONED US AS WE WERE DSNDING THROUGH 5000 FT. I ATTRIBUTE THE MISTAKE TO FATIGUE. MY COMPANY IS SHORT OF PLTS AND I'VE FLOWN IN EXCESS OF 100 HRS IN AUGUST AND NEAR 100 HRS IN JULY. 2 NIGHTS BEFORE THIS INCIDENT I GOT 5 HRS OF SLEEP ON MY 8 HR REDUCED REST OVERNIGHT. THE NIGHT BEFORE THIS INCIDENT; I DIDN'T GO TO SLEEP UNTIL PM00 FOR AN XA38 AM SIGN-IN. SO I HAD BOUT 10 HRS REST FOR 2 NIGHTS PRIOR TO THIS MISTAKE. I BELIEVE PART 135 REST REQUIREMENTS ARE INADEQUATE. THE 34 IN 7 RULE AND THE 120 HR MONTH RULE DO NOT PROVIDE CREWS WITH SUFFICIENT REST.