A grown human being needs between 8 and 9 hours of sleep, according to Matthew Walker, a scientist who devoted his whole life studying sleep.
Among other things, san influences our decision making.
Most of the things which are good for us, are not as often pleasant; it’s much more pleasant to sit for an hour than to workout; it’s much more delicious to eat donuts than salad; you require much less energy to watch cat’s videos than to read a book.
We are what we do; if we spend our days watching cats, we are a cat watcher; if we spend our days eating donuts, then we are Chief Wiggum.
Therefore, it’s important to make the right decisions.
When we don’t sleep enough, when we don’t spend at least 8 hours in bed, it is much more difficult to make the right decision and we are more often reaching for instant pleasure.