<human>: Give me the gist of the text in a nutshell

Okay, so I am a high school senior, and for the first semester and prior, I took the bus (I would not get a car until I successfully passed an online chem course to replace my grade). I slept on a regular schedule from 12:00 or so until 6:15, when my alarm went off. This steady cycle had worked for the better part of the year, as I had no trouble getting up at all. Then, by second semester, I passed the course and my dad handed over the keys to the car. However, he set one condition: I had to get a minimum of 7 hours of sleep every school night. He feels very strongly about the issue of sleeping behind the wheel, for he has had a co-worker get into a nasty wreck one morning from falling asleep. My dad himself has had a few close shaves. With all respect, I understood where he came from, so I obliged (I mean, hey. Free car). So 3 months ago, my sleep schedule has switched from 6 hours a night to 7 hours a night (from 11:00 to 6:00), and ever since then, it's been awful. I had no trouble falling asleep, but mornings have been destroying me. I figured it was a matter of getting into the new sleeping pattern, but these past few days, I've begun sleeping through my alarm, waking up some 10-20 minutes before class. Last night, however, was the worst. I had to stay up until 12 to finish a major paper/powerpoint assignment for English class, and I did. Problem is, this morning, **nothing could wake me up.** I found out when I woke up at 11am that I had slept through my alarm clock and my mom trying to rouse me on numerous occasions. Now I am on high alert regarding this struggle. Why is it that after 3 months of trying to establish this sleep cycle, it's only getting harder for me to wake up in the morning? Is there anything I can do? Take some pills? Buy a train horn?
<bot>: I slept through fucking everything, missed school, and I need to know why, and what I can d about it.