For those of you (I assume, a vanishingly small contingent) who are not constrained by either family or career, and consider yourself 'adult':
What time do you go to sleep and wake up, in order to feel physically and mentally happiest, and get stuff done?
After ten years of being a professional gambler, with generally awful sleeping patterns, and wanting to adult and be productive, I've been settling recently on 11.30-12 in bed with a book, usually asleep by 12.30, first alarm by about 7.30 and then out of bed by 8. Then walk the dog.