Well , listen, you're wrong - that's why you should read the book. Say you sleep 7 hours a night instead of 8. Brain keeps track of the sleep you take. If you m

Well , listen, you're wrong - that's why you should read the book. Say you sleep 7 hours a night instead of 8. Brain keeps track of the sleep you take. If you miss some, it adds it to your sleep debt. Then after a week you got full 8 hours extra sleep debt and even if you sleep 8 hours the night before you drive, you'll feel drowsy very soon after you wake up. Researches have been conducted which proved that the condition after a lack of sleep 1 hour each night during a week would be equal to the condition when you haven't slept through the night.