What are some signs that you might be projecting your own expectations onto your partner without realizing it?

I’m an MBBS student. I failed in my final professional exam despite studying really hard. I’m finding it really difficult to accept, and I don’t know how to deal with it or focus on studying again. How can I cope with this?
Why do people often treat sleep as lost time, when the brain may be using rest to organize memories, emotions, and learning?