Honestly, I can't remember. Twelve hours? That would mean I'm sick.
Many reports say the average adult should sleep for eight hours. I dont seem to be able to pass five.
I'm nocturnal, not sure if I'd that should be used for humans though. I find the night the perfect time to work online and do things I wouldn't be able to do comfortably in the daytime.
The nights are usually the best time to get good internet speed without throttling. Also, there are cheaper data rates available for surfing the web at those seemingly 'ungodly' hours.
I stay up most part of the night watching YouTube videos or learning new ways to make money. Most times, I sleep by 2 or 3am android wake up 5 5 or 6am respectively.
I don't think I've ever slept that long in my adult life not even the times I fell sick.
I sometimes wonder how people manage it.
I remember when I was on school and in the hostels, I had a roommate who would sleep from 8pm till about 12pm. It always beat my imagination how he managed to do it.
Sleeping for good number of hours is quite good as science tells us. It provides ample time for the system to be rejuvenated and for cells to regenerate. However, it could greatly affect productivity, especially if you are nocturnal like me.