Research shows that if you input anything into the mind before you go to sleep, the brain will consolidate the memory during sleep.
This improves the chance of what you put in going into long term memory. If your public speaking, this means you can better remember your talk.
There are other memory tips for public speakers at www.Speechmastery.com
Speak well and prosper.
To become a professional, one of the hurdles can be overcome by attending
AA for Public Speakers
Of course this is referring to Adjectives Anonymous. As a public speaker or speech writer if you learn how to kill the adjective, your speaking will improve.
Enjoy.
One of the constant challenges facing public speakers is simplicity. How con you give your message in the least amount of words and not lose any of the meaning of the message.
Sometimes somethings cannot be explained. If that is the case just say so.
For instance, how (and this is your illustration to say that you cannot describe something) would you describe the taste of a cherry?
Have fun with your use of words.