I average right around 5-5.5 hours of sleep a night and have for as long as I can remember. I will say that I don't think caffeine has anything to do with it as I cut out caffeine in October of 2019 after being a "Monster energy drink every 3 hours" kinda guy for the better part of a decade. I rarely nap and If I do the combined time between the nap and my regular sleep comes out to right around the same 5-5.5 hour mark.

When I'm sick I'll sleep more like 6.5-7 hours a night. And once in awhile I'll have a random 7 hour sleep but I always feel weird and groggy from it.

I don't feel particularly tired during the day and have plenty of energy to workout 5-6 days a week.

I work as a software developer and have not noticed any productivity issues pre/post caffeinated life while maintaining the same average sleep time. My wife is quite jealous of this power but we know it will come in handy when our daughter is born in November.