And he had a 'pattern of misbehavior' in the military
                                
                                
                                    (Newser) -
                                    Aaron Alexis, who is now believed to have been  the only shooter  behind yesterday's  Navy Yard massacre , suffered from serious mental issues, including paranoia and a sleep disorder, and had been hearing voices in his head, sources tell  the AP . Alexis also suffered from PTSD, his father told investigators,...