In every person, there is an internal clock. It is located in the brain and regulates the timing of certain functions. Everyone's internal clock is set to 24 hours, but it may vary. Genes are a factor of how fast or slow this internal clock, also known as circadian rhythms, ticks. Genes control circadian rhythm by encoding "clock proteins." This forms an internal feedback loop in which a cell will produce proteins within a span of 24 hours. The production of rhythm ticks does poorly in light because light indicates that it is daytime which limits the production of melatonin. This is only one example but this shows how genetics can cause the amount of sleep a person may get.
If you are a person that lacks sleep, there should be measures taken to allow the production of Circadian rhythm to function properly as eliminating light when you are trying to sleep.
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I never realized how much our genes influence how well we sleep. We always hear about caffeine, screens, or bad sleep habits being the problem, but this really shows that our internal clock our circadian rhythm is partly written into our DNA. Since certain genes control how fast or slow that clock runs, it makes sense why some people naturally stay up late or struggle to fall asleep even when they try. It also explains why light can throw everything off by blocking melatonin.
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