Whether you are a night owl or an early bird, don’t bother fighting the impulse because it’s probably in your genes, a study suggested Tuesday.

Scientists have long known that all plants and animals — from lowly phytoplankton to homo sapiens — have internal biological clocks attuned to a 24-hour cycle.

But within this so-called circadian rhythm, individuals of some species, including ours, may have a natural preference for day or night.

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