For me the best way to think about it is like a video game. You’ve got a health bar that depletes every day. Getting sleep is like taking a potion to replenishe the bar. 8 hours of sleep (or however much you need, 8 is typical but not the only number) brings you back to full health. Less than that brings you closer to full but leaves a deficit. More than that does nothing. When the health bar is maxed out more potions don’t do anything and they don’t wait until the bar starts draining to take effect.
The game also limits how many potions you can take a day. It’s wrong when people say you can’t make up sleep. It’s not like one bad sleep will leave you damaged forever. But it is true that you can’t go into deficit for weeks or months and make it all up by crashing for 16 hours that one time you got a break.
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