SKIP TO ”B” for the MAIN ANSWER ————A———— A lot of people in the modern world get their sleep disturbed by unnecessary schedules, bad environment (cities or simply speaking indoors), blue light (and all kinds like violet), hot rooms, closed light, EMF exposure, noise, stress, alarms / work times, being unhealthy, consuming wrong foods. This is purely dangerous and can even stop your body from growing if not getting good sleep. Those people simply CANNOT feel good and refreshed by going against nature. Just like the sun (check art.2 in nature’s category about SOL punishing you), again you get punished for doing the wrong things. Your own body tells you that just by how you feel. All of these stupid calculations - ”ohh I should sleep at that time or that time and get that much sleep etc” - are useless and stressful and don’t make any sense. There is also NO absolute way that you can make these calculations accurate, EVER. ”Seasons” change, and the time of a sunset and sunrise can change even a few man-made minutes ahead or before EACH and passing day (and yes that’s how it really is). That’s why it’s never accurate, and there is no way to calculate exactly how much your body needs to sleep. It’s stupidity. You can fall asleep and just by how you feel you can rate how much sleep you need. Or by the time you wake up. You should sleep how much your body wants to! You could never make a man-made schedule work. Never. If you’d set yourself maybe 8 hours of sleep (at a very late time), you’d get up feeling like sh!t and eventually get sleep insomnia. It’s impossible to adapt your body to that. You’re not supposed to stay awake for extremely long when it’s pure darkness (even though that could not be a problem for a natural primitive man, because he’d be aware sleeping (check African tribe documentaries), or stay if there is anything going on - but that’s NATURAL! So it won’t do almost any damage…). If a natural man would stay up on force (somehow without all the dopamine drive and electronics), then it wouldn’t be a big problem for him compared to the modern human (even with 😳).