E140 CREW ACCEPTED AN ALT XING RESTR THE ACFT WAS UNABLE TO COMPLY WITH IN D10 CLASS E AIRSPACE.

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WE WERE CLRED DIRECT UKW AND THE UKW ARR TO DFW. THERE'S A NOTE TO EXPECT TO CROSS THE FIRST FIX PAST UKN AT 11000 FT AND 250 KIAS. AS THE PF; I ENTERED THE EXPECTED XING RESTR INTO THE FMS WITH A 5 MI PAD FOR SLOWING DOWN TO 250 KIAS. ATC BEGAN ISSUING STEP-DOWN DSCNTS FROM FL370 AND TO MAINTAIN 300 KTS. AS WE REACHED; I THINK; THE THIRD STEP-DOWN AT 15000 FT; ATC STILL HADN'T ISSUED THE XING AND WE FLEW THROUGH THE FMS PSEUDO-GS FOR THE XING. GIVEN OUR ALT AND DISTANCE FROM THE FIX; I WONDERED IF ATC WAS GOING TO GIVE THE EXPECTED XING. SHORTLY THEREAFTER; WE WERE GIVEN THE XING AND TO COMPLY WITH SPDS ON THE STAR. AS I RECALL; I REACHED 11000 FT A COUPLE OF MI SHORT OF THE FIX; BUT ALTHOUGH I WAS AT IDLE THRUST; I CROSSED THE FIX ABOUT 280 KIAS VICE 250 KTS. JUST BEFORE REACHING 11000 FT; ATC ISSUED A DSCNT TO 7000 FT. I CONTINUED DOWN WHILE TRYING TO SLOW TO 250 KTS. I NOTICED I WAS ABOVE 250 KTS PASSING THROUGH 10000 FT. I IMMEDIATELY STOPPED THE DSCNT AT ABOUT 9700 FT MSL AND SLOWED TO 245 KIAS BEFORE CONTINUING TO 7000 FT. THIS WAS CLRLY A LACK OF SITUATIONAL AWARENESS. IN ADDITION; DUE TO A LACK OF SELF-DISCIPLINE; I ONLY GOT ABOUT 5 HRS OF SLEEP THE NIGHT BEFORE. I THINK THE SELF-INDUCED FATIGUE WAS A CAUSAL FACTOR. RECOGNIZING I WAS TIRED; I SHOULD HAVE REQUESTED AN AMENDED CLRNC FROM ATC. I AM UNAWARE OF ANY TFC CONFLICT.