> Wake up at sunrise, go to bed at sunset. Anything else is going to cause problems..
That's at least 10 hours of sleep per day, for a large part of the year.
It's also no sleep at all, in some parts of the year, for some countries.
That's at least 10 hours of sleep per day, for a large part of the year.
It's also no sleep at all, in some parts of the year, for some countries.