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Bottom: “Naron” and an unidentified girl at dawn after an all-night beach party, Tokyo, 1964.

Top: “Naron” (at left, stretching) and friends at dawn after an all-night party at the beach.

Bottom: Caption from original story in Sept. 11, 1964, issue of LIFE: “[Yoko] often ends her long nights sprawled on a futon in a friend’s room.”

Dancing to the “Tokyo Beatles,” 1964.

Lost in music, Tokyo, 1964

Bottom: Caption from original story in Sept. 11, 1964, issue of LIFE: “They find violent release in homegrown Japanese Beatles.

Bottom: A group of “motorcycle kids,” one of numerous subsets of teen subcultures in Tokyo, 1964.

Bottom: The teen in the center is the 17-year-old leader of a pill-popping crew of jazz fans. He’s known only by his nickname, “Naron,” a popular sleeping pill brand. Morse wrote in his notes that Naron was “bright and amusing when he’s off the pills.