I sleep around 7.5-8 hours on weekdays, and I get up at the last possible moment at 8:30am, so not even ridiculously early. But on weekends I need at least one of the days to be a lie in otherwise I am exhausted. Today I slept 12 hours, and woke up at 12:30pm. When I have time off work, I will sleep naturally 10-12 hours a night everyday - even for weeks on end. On holidays with other people I have sometimes been close to tears because the sleep is not enough despite us all getting back to the hotel the same time and waking up at the same time.
I have always been like this, I don't have children (everyone tells me I'll change if I have children and get used to having no sleep). No health conditions, no sleep apnoea, etc.
AIBU to think that some people do genuinely need more sleep than others?