Why we all must sleep?

Question

plz plz plz xplain to me!

Answer 1

We all must sleep atleast for 8 hours a day..as this gives the rest to body...

We have to sleep because it is essential to maintaining normal levels of cognitive skills such as speech, memory, innovative and flexible thinking. In other words, sleep plays a significant role in brain development.

Answer 2

As the field of sleep research is still relatively new, scientists have yet to determine exactly why people sleep. However, they do know that humans must sleep and, in fact, people can survive longer without food than without sleep. And people are not alone in this need – all mammals, Hynos, god of sleepreptiles and birds sleep.

Scientists have proposed the following theories on why humans require sleep:

* Sleep may be a way of recharging the brain. The brain has a chance to shut down and repair neurons and to exercise important neuronal connections that might otherwise deteriorate due to lack of activity.
* Sleep gives the brain an opportunity to reorganize data to help find a solution to problem, process newly learned information and organize and archive memories.
* Sleep lowers a person’s metabolic rate and energy consumption.
* The cardiovascular system also gets a break during sleep. Researchers have found that people with normal or high blood pressure experience a 20 to 30% reduction in blood pressure and 10 to 20% reduction in heart rate.
* During sleep, the body has a chance to replace chemicals and repair muscles, other tissues and aging or dead cells.
* In children and young adults, growth hormones are released during deep sleep.
* When a person falls asleep and wakes up is largely determined by his or her circadian rhythm, a day-night cycle of about 24 hours. Circadian rhythms greatly influence the timing, amount and quality of sleep.

For many small mammals such as rodents, sleep has other particular benefits, as it provides the only real opportunity for physical rest, and confines the animal to the thermal insulation of a nest. In these respects sleep conserves much energy in such mammals, particularly as sleep can also develop into a torpor, whereby metabolic rate drops significantly for a few hours during the sleep period. On the other hand, humans can usually rest and relax quite adequately during wakefulness, and there is only a modest further energy saving to be gained by sleeping. We do not enter torpor, and the fall in metabolic rate for a human adult sleeping rather lying resting but awake, is only about 5-10%.

More than 20% of Americans are shift workers who work and sleep against their bodies’ natural sleep-wake cycle. While a person’s circadian rhythm can not be ignored or reprogrammed, the cycle can be altered by the timing of things such as naps, exercise, bedtime, travel to a different time zone and exposure to light. The more stable and consistent the cycle is, the better the person sleeps. Disruption of circadian rhythms has even been found to cause mania in people with bipolar disorder.

Answer 3

we need to sleep because we put our body through so much stress during the day that when we sleep our brain has to rest and our bodies relax so that we can be ready for another day ,think of our bodies as well oiled machines the more we look after them the longer they last

Answer 4

We need to sleep in order for our minds to rest. Our body also needs to rest to regain the energy for the next day.
Resting keeps us focused and on point. When you dont sleep you can be delirious

Answer 5

Sorry. I am sure this is a hard question to even the greatest of the scientists specializing in this field.

Answer 6

we must sleep because it can give our energy back...