why do people need to sleep?

Answer 1

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

Answer 2

Eight hours of sleep a day seems like a colossal waste of time, doesn’t it? After all, in the hectic world we live in, those precious hours could be put to use responding to all those e-mails or hitting the spa. So why do we need so much sleep?
We don't fully understand the importance of sleep. What we do know is that sleep is an anabolic, or building, process. And we think it restores the body’s energy supplies that have been depleted through the day’s activities.

Sleep is also the time when the body does most of its repair work; muscle tissue is rebuilt and restored. We know, for example, that growth hormone is secreted during sleep. This hormone is important for growth in children, but is also important throughout adulthood in rebuilding tissues.

Think of the body as a car. No car can keep going and going and going without a tune-up or oil change. If it’s not tuned, the car may keep running, but not as smoothly as it did when it was maintained properly. You can think of sleep as your body’s daily tune-up.

Answer 3

The question is a one liner but the answer, well....

Our body is like a machine, a very advanced one! Like machinaries need feul to keep on constantly working we also need it, in the form of energy. Most of that energy comes from the food we eat and sleep, and it gets spend in the work we do...

Sleep removes your tiredness and hang overs... You need it to regenerate yourself... Only eating food won't help, you see when we eat, majority of our blood moves in the stomach to help in digestion, the heavier the meal, the more the sleepiness you will feel. As the blood moves in the stomach there is deficiency of oxygen in brain, and to maintain this balance we sleep...

Also there's a kind of a clock in our brain which tells our body how much sleep we need, and when we need it.. Like if you sleep for 7 hours a night, but couldn't complete those due to some reason, you will feel sleepy all day long...

It's all in habit, you can alter your body for long sleeps or for cat naps, but the most efficient time is 11 in the night to 7 in the morning, give or take 1...

Now, what sleeping does is regenerates that energy back

Answer 4

Wow, this question needs pages to answer scientifically, but in layman's terms Sleep is necessary to allow the brain (mainly) and body to recover from the strain caused by activities of the previous day. The conscious part of the brain switches off leaving only the life support and subconscious parts running.
There is a lot of information on this subject on the web. I would start with Wikipedia and follow the links. see http://en.wikipedia.org/wiki/Sleep

Answer 5

as its the only way left today in order to rest the mind completely.and no rest to mind may harm the work we do next. there is a schedule for every age group to state how many hrs they should sleep ie.. children uo mto 1 yr 18 hrs a day, up to 5 yr 16 hrs a day, up to10 yrs 12 hrs a day,up to 20yrs 8 hrs ,up to 40 yrs 6 hrs 40 ,up to 60 7 hrs and above 60 10 hrs a day

Answer 6

The reason we need to sleep is because during the day our muscles make a chemical (toxins) that fatigues are muscles and therefore we must sleep so our muscles can get rid of the toxins.

Answer 7

The biological clock needs rest at regular intervals!

Answer 8

Honestly, nobody knows. We have no idea why it's required, but we do know that if you go long enough without it, you will die. Look-up a disease called Fatal Familial Insomnia. It's a genetic disease that kills anyone who has it.

Answer 9

To recharge, To heal, to let your mind rest,to releive stress,to live some of your dreams,

Answer 10

it is the the biological programme of the body to keep fit and replenish