Original: The word derives from the Greek '' '' ( mania ) , '' madness , frenzy '' , Henry George Liddell , Robert Scott , A Greek-English Lexicon , on Perseus Digital Library and that from the verb '' '' ( mainomai ) , '' to be mad , to rage , to be furious '' .
Simplified: Symptoms of mania include talking very fast , racing thoughts , less need for sleep , , and increased interest in goal-directed activities.DSM-IV The affected person may behave unusually .