i feel for ya bud... same thing happened to me last semester and on the syllabus it says "NO MAKEUPS PERIOD.. NO EXCEPTIONS!"
BUT , i looked up my prof's number from the UT directory, called her up and told her the truth that i just overslept, i feel terrible and i didn't do it on purpose. well, the only reason i was allowed to make it up was because i had good attendance and participation in class which made it easier for her to decide if i skipped on purpose or not. if the prof knows you have crappy attendance or anything, then ur prolly screwed. good luck to you
*edit*
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Was up all night working on a stupid project. Decided to take a 15 minute nap that was 3 hours ago. >>
THAT'S EXACTLY WHAT HAPPENED TO ME!!!
I had a final in the morning from 11- 2 that i stayed up all night for, and this final was at 5:30. i decided to take a "power nap" and woke up around 7... not a good idea *edit*