They can wake up earlier and go to bed earlier. Nothing prevents them from utilizing the sunlight due to a nominal time designation. But the time designation ch

They can wake up earlier and go to bed earlier. Nothing prevents them from utilizing the sunlight due to a nominal time designation. But the time designation changes the structure of all activity unrelated to sunlight for no obvious reason other than “I don’t want to wake up an hour earlier to get that extra hour of sunlight.”