this is sad.. i've suffered from this all my life. i recently employed 5 different alarm clocks to go off sometimes all at once or at different times. i hit a record low this week when i slept through all of these annoying alarm.. heck, one of them is of a woman screaming.. very high pitch. very annoying. yep, i slept through it. the best advice is as someone up above said, get a routine. calculating your sleep helps. I can normally run on 4 hr sleep, but then id need an hour to "recover" from sleep (by laying in bed, ofcourse---superlazy).. and an hour to get ready for wherever i have to go.. so thats about a 6hr headroom for myself. ofcourse, this can be achieved in less time--less time recovering/getting ready.

hope my routine makes sense to someone..