Article continues below advertisementDonald Trump's nighttime behavior has been problematic since his first day as commander in chief.In a new "Inside Trump's Head" podcast episode, famed biographer Michael Wolff explained how the Secret Service put an end to one of the president's peculiar bedtime habit."During the first administration, he had a lock installed on his bedroom door, and that precipitated a fight with the Secret Service, who actually took it off - demanded it be taken off. This was a confrontation," Wolff revealed of the president.