DC and NY get to sleep close to midnight local time, while Hawaii is lights out just after 11pm
                                
                                
                                    (Newser) -
                                    Sleep is crucial to our existence, with most adults needing between seven and nine hours a night to best function, per  Axios . Yet the average clocked by Americans is only six hours and 40 minutes, per stats from the latest  Apple Heart and Movement Study , which examined almost 17 million...