I go to sleep at about 3am and wake up at 3pm.
I sleep a lot.
This is true of me.
My entire immediate family is comprised of late sleepers and late wakers.
We'd prefer to sleep through the morning and enjoy the afternoon and the nightlife.
Whereas my aunt and my cousins are the complete opposite.
They have to get to bed early and they have to sleep early.
I fear that if they were to be kept up late, they'd die.