I was once able to fix a bug in my dream, which actually worked out in real life - although, I needed to jump up to my laptop and hack in the solution, as the dream was fading away

Although can’t really recommend dreaming of work…

One time when I was in college, I was in chemistry class. It was a class I had a lot of trouble with but this time I was actually able to follow along with the professor and take good notes. Then I woke up, I was in chemistry class, but I had slept through half the lecture.