Reply To: why “early to bed, early to rise” and not “late to bed, late to rise”?

going to sleep is influenced by biological clock – when you feel tired. Getting up is driven by social restrictions – school and work openings. Thus, those in Eastern part of the time zone go to sleep earlier (in clock time) and sleep more than those in the Western. There is research taking pair of US cities one in the western part of their time zone, others – on the eastern in the next time zones – and the Easterners have higher average IQs and incomes.