Donald Trump wanted everyone to know one thing before he boarded Marine One on Friday: He never gets tired. Not ever. The 80-year-old delivered the boast straight-faced, even tacking on a punchline about how big a news story it would be if he ever ran out of gas. It was a bold claim from a man who has been caught nodding off in front of cameras so often that “Sleepy Don” has practically become his second title. But this time, it wasn’t his eyeli…