Poor Concentration is a feeling of mental fogginess. Our memory just isn’t what it once was or our ability to problem solve or do creative work has decreased. Men with hormone deficiencies sleep less and less soundly. Poorer quality sleep affects your REM (rapid eye movement) which is important for all sorts of cognitive functions. Over time, those never getting a total of eight hours sleep will experience numerous problems including decreased concentration, extreme tiredness, decreased memory and decreased motor skills. So you can see how different deficiencies create other symptoms. Until you start treating the deficiencies causing the problems, the cycle of hormonal symptoms will not stop. Bio-identical hormone replacement therapy can help regain your youthfulness of your 30s.