There has been research that has shown that as much as 10% of our energy metabolism goes down while we sleep. Other things that decrease while we sleep are things such as the temperature of our body and the need for caloric intake. As of now, no one really knows why we sleep, but there are many, many theories for it, to try to explain what we don't understand yet.
The main theory that is most commonly believed is that when we sleep, its because our body needs time to process, strengthen, and restore everything it needs in order for us to be our best.
One of the main parts about sleep is helping us reinforce and consolidate our memories, because throughout the days, we collect a very heavy amount of information and we really need time to process it. …show more content…
So the conclusion here is that the only real solid piece of evidence that we have that we need to sleep is that we get sleepy and would eventually pass out anyway. This has been: Why do we need