It's the same for me that I fall asleep if I do something I'm either unmovitated to do or that is above my level.
I think you have to admit first that you might be not as smart as you think you are. Highschool was easy. I don't want to sound arrogant, but the American high school is considered a joke in Europe. Not so much university. They are really good and can be equally tough. So maybe you simply experienced and continue to experience your current limit.
You need to sit down just as everyone else and study for real.
How to do it:
If you have trouble getting started at all, convince yourself that you'll do ony one page or so. Mostly, you can do more.
Try the pomodoro technique. Set a timer to 25 minutes and then take 5 minutes break. This has two effects: a) The chunk of work doesn't seem to be so much. b) You get a break before you are exhausted. If 25 minutes is too hard, adjust to 15.
Divide the textbook in extremely small chunks you need to understand and are able to understand. This might take a long time, but I typically fall asleep if I don't even get an idea where to start. You have to start somewhere and it should be very small.
And if nothing helps: Go back to the basics or get a different textbook that works better for you.
The method enables you to concentrate without distractions, and encourages deep thinking, which is what you need to be able to do to operate at a very high mental level.
I think you have to admit first that you might be not as smart as you think you are. Highschool was easy. I don't want to sound arrogant, but the American high school is considered a joke in Europe. Not so much university. They are really good and can be equally tough. So maybe you simply experienced and continue to experience your current limit.
You need to sit down just as everyone else and study for real.
How to do it:
If you have trouble getting started at all, convince yourself that you'll do ony one page or so. Mostly, you can do more.
Try the pomodoro technique. Set a timer to 25 minutes and then take 5 minutes break. This has two effects: a) The chunk of work doesn't seem to be so much. b) You get a break before you are exhausted. If 25 minutes is too hard, adjust to 15.
Divide the textbook in extremely small chunks you need to understand and are able to understand. This might take a long time, but I typically fall asleep if I don't even get an idea where to start. You have to start somewhere and it should be very small.
And if nothing helps: Go back to the basics or get a different textbook that works better for you.