That’s because this guy is probably a teenager or very early 20s and the circadian rhythm of that group is ~3 hours behind.
Or maybe we’re suffering from this exact lifelong issue well into our 30s…
Some people inherently have a later sleep schedule. The reason that’s associated with younger people is that up until relatively recently, there was a stigma against night owls and people were culturally pressured into conforming. Now we understand it’s healthier to follow your natural sleep schedule and live around it.