My memory seems to be slowly deteriorating. I also find it hard to focus and concentrate. Could you list some memory or cognitive enhancers… (Include color enhancement on memory, smell on with cognition or memory (Rosemary, et cetera) Frequencies (Binaural Beats) Green Tea, Techniques, Repetition, Supplements that actually work properly (including ginkgo biloba, b12, b1…) Other foods that assist in recognition and cognition (chocolate), or even harmless herbs).

Does the brain retain information while you are sleeping. For example, listening to a poem while you are sleeping. Is it possible to just wake up and begin reciting the poem, miraculously?
I would really appreciate thorough, well thought out responses!
Thank You!
… answer please….