Sun cycle varies widely during a year i.e. Sun rises at ~8.30am and sets at ~4pm here now, so do you really imply I should sleep 17 hours a day? Similarly, I sh

Sun cycle varies widely during a year i.e. Sun rises at ~8.30am and sets at ~4pm here now, so do you really imply I should sleep 17 hours a day? Similarly, I should get up before 5am at summer. I agree that, ideally, yes, we should align with the Sun cycle, but as many things in real world, it's just not possible or practical.