does anyone know for a fact. "how many hours we need to sleep"? can you give me sources to back up ur answer
Question:
Answers:
7-8 hours
Other Answers:
8-9 for adults are fine. 10 11 for childrenhttp://www.helpguide.org/life/sleeping.htm
Source(s):
Getting the Sleep You Need: Sleep Stages, Sleep Tips and Aids
Driver fatigue is responsible for an estimated 100,000 motor vehicle accidents and 1,500 deaths each year.
Source: National Highway Traffic Safety Administration
On this page: What is sleep? | Why do we need sleep? | Sleep stages | How much sleep do I need? | How do I know if I am getting enough sleep? How will sleep deprivation affect me? | What is insomnia? | Insomnia causes | How is sleep affected by caffeine, medications, heavy smoking and alcohol? | How can I improve my sleep? | Sleep tips | Will sleep medications and sleep aids help me sleep better? | Sleep deprivation and depression | References and resources | eBook contents
Getting the Sleep You Need
Sleep Tips
Sleep Disorders
Insomnia Causes
Insomnia Treatments
Sleep Aids & Medications
Narcolepsy
Restless Legs (RLS)
Sleep Apnea
Snoring
Sleep & Aging
Sleep is one of the body’s most mysterious processes. The idea of sleeping well conjures up restful images of fluffy pillows, comfortable blankets and minimal activity. This article provides information to help you get the sleep you need.
What is sleep?
Sleep is a periodic state of rest during which consciousness of the world is suspended. The most significant characteristic of sleep which differentiates it from the waking state is the interruption of perception; a sleeping person does not see or hear. Additionally, sleep is marked by:
decreased movement of the skeletal muscles,
slowed-down metabolism, and
complex and active brain wave patterns.
Sleep consists of five stages and is an essential component of a healthy body and mind.
Why do we need sleep?
Sleep helps the body restore and rejuvenate in many different ways including:
Memory, Learning and Social Processes – Sleep enables the brain to encode new information and store it properly. REM sleep activates the parts of the brain that control learning. The parts of the brain that control emotions, decision-making and social interactions slow down dramatically during sleep, allowing optimal performance when awake.
Nervous System – Some sleep experts suggest that neurons used during the day repair themselves during sleep. When we experience sleep deprivation, neurons become unable to perform effectively and the nervous system is impaired.
Immune System – Similarly, sleep also enables the immune system to function effectively. During deep sleep, the body’s cells increase production while proteins break down at a slower rate. Without proper sleep, the immune system becomes weak and the body becomes more vulnerable to infection and disease.
Growth and Development – Children need much more sleep than adults. Growth hormones are released during sleep, so sleep is vital to proper physical and mental development. The effects (positive and negative) of sleep for babies and children are magnified. Tired children are often cranky, fussy and become easily frustrated and difficult. It is often easier for adults to interpret and remedy the effects of tiredness in children than for them to listen to their body’s own signals for more rest.
What are the stages of sleep?
There are five stages of sleep: stages 1, 2, 3, 4 and REM (rapid eye movement). The body cycles through the different sleep stages from stage 1 to REM and then begins again with stage 1. Each stage represents a different physical and mental state of the body during sleep. During some stages, the body is in a lighter sleep and can be awakened more easily, while others indicate a very deep sleep.
The National Institute of Neurological Disorders and Stroke provides this description of the five sleep stages (from Brain Basics, see references & resources):
Stage 1 (Drowsiness) – We drift in and out of sleep for about 5 to 10 minutes and can be awakened easily. Our eyes move very slowly and muscle activity slows.
Stage 2 (Light Sleep) – Our eye movements stop and our brain waves (fluctuations of electrical activity that can be measured by electrodes) become slower, with occasional bursts of rapid waves called sleep spindles. Our heart rate slows and body temperature decreases.
Stages 3 and 4 (Deep Sleep) – Slow brain waves called delta waves begin to appear, interspersed with smaller, faster waves. By Stage 4 the brain produces delta waves almost exclusively. It is very difficult to wake someone during stages 3 and 4, which together are called deep sleep. There is no eye movement or muscle activity. People awakened during deep sleep do not adjust immediately and often feel groggy and disoriented for several minutes after they wake up. Some children experience bedwetting, night terrors, or sleepwalking during these stages.
REM Sleep – During REM sleep, our breathing becomes more rapid, irregular, and shallow, our eyes jerk rapidly in various directions, and our limb muscles become temporarily paralyzed. Our heart rate increases, our blood pressure rises, and males develop penile erections. People dream during this stage.
The average length of time for a complete sleep cycle is 90-110 minutes. About 50 percent of sleep time is spent in stage 2 and about 20 percent in REM sleep. The remaining 30 percent is split among the other stages. On average, a person will cycle through the stages 4 or 5 times in an eight hour period. After a person falls asleep, the first REM sleep period generally happens 70-90 minutes later.
The first cycles of the night will tend to have shorter REM periods and longer periods of deep sleep. This trend reverses as the night goes on. The later cycles have longer REM periods and shorter deep sleep periods. By morning, most sleepers spend almost all of their time in stages 1, 2 and REM sleep with very little or no deep sleep (stages 3 and 4). Infants are unique in that they spend approximately 50 percent of their sleep time in REM sleep.
How much sleep do I need?
Many people don’t assess how much sleep they need to function at their best; they just know they don’t get enough. Each person’s sleep requirement is different. Some people find that they only need 5-6 hours of sleep, while others need 10-11 hours for optimal performance. The average adult functions best with 7-8 hours of sleep a night; however, it is important to consider how much sleep you need on an individual basis.
Some guidelines to help you consider how much sleep you or your loved ones might need are:
Infants and Children – Infants require about 16
i can't but with me i tend to need 1 hour of sleep for every 2 hours i am awake.
7 to eight hours depends on the person look up just google sleep and go from there you will find alot of info
We are each individual & our sleep needs differentiate depending on age, sex, & activity/stress level.
The amount of sleep a person needs depends on the individual. The need for sleep depends on various factors, one of which is age. Infants usually require about 16-18 hours of sleep per day, while teenagers need about 9 hours per day on average. Most adults need about 7-8 hours of sleep per day.
The amount of sleep a person needs also increases if he or she has been deprived of sleep. People do not seem to adapt to getting less sleep than they need.
What Are the Consequences of Too Little Sleep?
Too little sleep may cause:
Impaired memory and thought processes.
Depression.
Decreased immune response.
Sleep deprivation also magnifies alcohols effects on the body, so a fatigued person who drinks will become much more impaired than someone who is well-rested. Caffeine and other stimulants can temporarily overcome the effects of severe sleep deprivation, but cannot do so for extended periods of time.
Source(s):
http://www.webmd.com/content/article/105/107660.htm
http://www.webmd.com/content/article/105/107668.htm
I think it fully depends on the person. My sister and I are around the same age, and I need so much more than she does. In fact, as a young person I shouldnt really b affected if I go to be at 11:30pm continuosly (with waking at 7:30am), but it does.
An adults should sleep for 8 hours. The timings should be from 9.30pm to 5.30AM. The main source is this makes the person healthy and this keeps his face fress. And early to bed and early to rise is best for health and freshnees for whole day.
Source(s):
Personal experience.
Hmm, looking at this question made me feel ashamed of myself. What am I doing up at 2:50am Eastern Standard Time?
why dont you go to the web and find out. they have everything in detail and all u want to know..
am i doing your homework for you?
It depends upon what you do throughout the day.If you are a very active person,you need at-least 7 to 8 hours of sleep.For adults at-least min 6 hours of sleep is required.
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