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Historically, this time was recognized long before the advent of sleep laboratories. In Scandinavian folklore, it was dubbed the “Hour of the Wolf”—a term popularized in the 20th century by filmmaker Ingmar Bergman. It was described as the period when nightmares feel most visceral, when the majority of births and deaths occur, and when the metaphorical veil between reality and the subconscious is at its thinnest. It is the time when the “sleepless are haunted by their deepest fears,” and the mind confronts what the distractions of daylight usually keep buried. Even in 2026, this phrase resonates because it accurately captures the strange emotional gravity of being awake while the rest of the world sleeps.