Eli5: Why do we end up more tired from sleeping longer than recommended amounts?

Question

Why is it when you sleep for 10-12 hours you end up more tired throughout the day than if you had 8 hours of sleep?

In: Biology

Answer 1

I do 2 earlies 5.45 start, 2 lates, 1500 start and then 2 night 9pm-6am. Then get 4 off. I’m ALWAYS tired.