An article from Saxena Lab explains that whether someone is a “morning person” or a “night owl" is about 20-50% influenced by their genetics. A large study of nearly 700,000 people identified 351 genetic variants linked to sleep timing. These genes affect the body’s internal clock, which controls sleep, energy levels, hormones, and hunger. Differences in how people respond to light may explain why some people naturally stay up later than others. However, in modern times most people do not wake up naturally and rely on an alarm of sorts to wake them for their daily obligations (such as work or school) so people are much less likely to wake up at their "natural" time. Furthermore, another article suggests that ignoring your internal alarm aka circadian rhythm, may be unhealthy and linked to several mental and physical illnesses. All in all, while there is a genetic link for the time you wake up, many modern obligations and environmental factors are more influential on you circadian rhythm.
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