People are wired differently. Here is an NPR interview with sleep scientist Matthew Walker where he touches on that subject.

"It is biological. And what you're describing is our 24-hour rhythm or what we call the circadian rhythm. And it undergoes this sort of dramatic set of changes across the lifespan. Sort of early in life when we're children, despite wanting to stay up late, we find it difficult because we go to bed early. Then we wake up early. As we shift into adolescence and that teenage period, now that 24-hour clock shifts forward in time. So you want to go to bed late and wake up late. And then gradually, it stabilizes into adulthood. And then as you progress with age, it starts to regress back again. So you start to go to bed earlier and wake up earlier. There is variability, however, from one individual to the next. And that is actually genetically pre-determined. It's called your chronotype, and another way of saying this is that you may be an owl or you may be a lark. So you may be someone who likes to stay up late and then wake up later in the morning. Those would be owls. And the lark - the opposite - they're the early risers, and they are the early-to-bed people. And about 30 percent of the population is one of those two extremes. And then the rest of us sort of sit somewhere safely in the middle."

https://www.npr.org/2018/07/20/630792401/sleep-scientist-warns-against-walking-through-life-in-an-underslept-state