This happens to me a lot when writing fiction; I can see the action or feel the emotion I want, but finding the words to describe can sometimes be very difficul

This happens to me a lot when writing fiction; I can see the action or feel the emotion I want, but finding the words to describe can sometimes be very difficult. (Also depends on what time it is, I'm particularly bad at it in the morning.) Related is when you forget a word. You've got the specific meaning in your mind, and you know there exists a word for it, and it's in your brain somewhere, but you just can't get the appropriate neurons to fire to give it to your conscious mind. (And then it might randomly appear to your during some other random task.)