I go through spells where I have the same problem you are describing.

It got to the point where I wasn't waking up to be at work by 8:00 a.m. Then I would wake up late, skip showering, put my dirty hair in a ponytail, forget makeup, throw on some clothes, and race to work.

Then I was reprimanded and told that if I was late one more time, I would be fired.

I ended up getting fired anyway.

What I've learned (and it might help you) is that it is really important to stick to a schedule.

Decide on a time to go to bed every night, no matter what. Even if it's the weekend. Even if you don't have to be at class until later in the day.

Go to bed at that time. Even if you aren't tired. Make sure your room is totally dark.

If you don't have a prescription sleeping pill, try Tylenol PM. I can only take 1 Tylenol PM (instead of a dose of 2) or I won't hear alarms in the morning.

I've got Ambien, but I don't use it every night because I don't want to develop a problem with it.

Wake up when your alarm goes off WITHOUT HITTING SNOOZE. Now, of course, if you aren't hearing the alarm you aren't going to wake up. Set several alarms. I ended up setting an alarm clock setting my cell phone with an alarm and a backup alarm both set to vibrate, and I had my computer next to my bed with an alarm clock website up and set to go off really loud. (Yes, I know you're supposed to have the room totally dark, but I left my computer on with the lid almost closed and turned it the other direction so the light would be less bright toward me because I knew I needed the extra alarm.)

It may take several days (or longer) to get your body used to this. It may be rough. You might be kind of groggy during the day and find yourself wide awake when it's time to go to bed. But once your body adjusts, stick with that schedule so you don't have to go through all that again.