You said you felt a plot in your dream. It's entirely possible. I am still reading a novel in my dream!
Secondly, it's normal for you to say that you forgot your dream after waking up, because your brain is resting when dreaming, so your memory ability drops, and of course you don't remember it after waking up.
Also, the brain needs time to recover after waking up, so it will look groggy after getting up.
Finally, you don't have to worry at all.