why do we sleep?
We need sleep to memorize things.
"Scientists simply don't know for sure. In broad terms researchers believe it is to enable our bodies and especially our brains to recover. Recently researchers have been able to find out some of the detailed processes involved.
During the day brain cells build connections with other parts of the brain as a result of new experiences. During sleep it seems that important connections are strengthened and unimportant ones are pruned. Experiments with sleep-deprived rats have shown that this process of strengthening and pruning happens mostly while they sleep.
And sleep is also an opportunity for the brain to be cleared of waste.
A group led by Prof Maiken Nedergaard at the University of Rochester Medical Centre in New York discovered a network of microscopic fluid-filled channels in rats that clears waste chemicals from the brain. Prof Nedergaard told BBC News when her research was first published in 2013 that this process occurs mostly when the brain is shut off.
"You can think of it like having a house party. You can either entertain the guests or clean up the house, but you can't really do both at the same time."
We need sleep to memorize things from the day if you get enough hours of sleep your able to memorize stuff you learned through out the day. For example if you go to school tired with no sleep you are more likely to not remember what you learned that day. Or going tired on a test day if its a reading test you will have trouble being able to remember the story or even understand the story.
we also need sleep to have energy and be more healthy.
"As with eating well, good sleep is a staple of optimal health.
While we may not often think about why we sleep, most of us acknowledge at some level that sleep makes us feel better. We feel more alert, more energetic, happier, and better able to function following a good night of sleep. However, the fact that sleep makes us feel better and that going without sleep makes us feel worse only begins to explain why sleep might be necessary.
One way to think about the function of sleep is to compare it to another of our life-sustaining activities: eating. Hunger is a protective mechanism that has evolved to ensure that we consume the nutrients our bodies require to grow, repair tissues, and function properly. And although it is relatively easy to grasp the role that eating serves— given that it involves physically consuming the substances our bodies need—eating and sleeping are not as different as they might seem.
Both eating and sleeping are regulated by powerful internal drives. Going without food produces the uncomfortable sensation of hunger, while going without sleep makes us feel overwhelmingly sleepy. And just as eating relieves hunger and ensures that we obtain the nutrients we need, sleeping relieves sleepiness and ensures that we obtain the sleep we need. Still, the question remains: Why do we need sleep at all? Is there a single primary function of sleep, or does sleep serve many functions?"
"Why Do We Sleep, Anyway?" Why Do We Sleep, Anyway? N.p., n.d. Web. 19 May 2015.
"Why Do We Sleep? - BBC News." BBC News. N.p., n.d. Web. 20 May 2015