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Decide whether the statement is True, False, or Not Given.

Sleep researchers have long studied why some people are naturally early risers while others prefer late nights. This tendency, called a person's chronotype, appears to be shaped partly by genetics and partly by age. Teenagers often shift toward later sleep, while many older adults drift earlier. Light exposure also plays a strong role, since bright morning light helps reset the body's internal clock. Some studies suggest that forcing 'night owls' into early schedules can harm their concentration and mood. Researchers debate whether schools and workplaces should adjust their hours, but few institutions have made such changes so far.