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Intermediate Chronotype

Meaning

The Intermediate Chronotype, often referred to as the “Hummingbird” type, represents the largest segment of the population whose sleep-wake preference and peak alertness times align closely with the conventional societal 24-hour schedule. Individuals with this chronotype typically feel naturally inclined to fall asleep between 11:00 PM and midnight and wake up between 7:00 AM and 8:00 AM. This profile reflects an endogenous circadian period that is efficiently entrained to the solar day and social schedule, placing them between the extreme “Lark” (morning) and “Owl” (evening) chronotypes. Their physiological rhythms, including the core body temperature minimum and melatonin onset, occur at times considered standard for the general adult population.