Along with the perils of navigating the foggy Atlantic, Lindbergh’s biggest challenge during his transatlantic flight was simply staying awake. Between his pre-flight preparations and the 33.5-hour journey itself, he went some 55 hours without sleep. Lindbergh went so far as to buzz the surface of the ocean in the hope that the chilly sea spray would help keep him awake, but 24 hours into the journey, he became delirious from lack of rest. He later wrote of mirage-like “fog islands” forming in the sea below, and of seeing “vaguely outlined forms, transparent, moving, riding weightless with me in the plane.” Lindbergh even claimed the apparitions spoke to him and offered words of wisdom for his journey. The hallucinations eventually faded, and only a few hours later, the exhausted aviator landed in Paris to a crowd of more than 150,000 jubilant spectators.