Thread: Sleep

Originally Posted by banj_rave_03

you're right.. if you doesnt sleep.. you will feel that ur weak..

na i feel fine. but if i do it for 2 days in a row then i fell weak

I only get about 5-7 hours of sleep a night, because im mostly on the internet or reading

if you go without sleep
your abilty to learn drops
your libdo increases
hallucinations start around day 3
i think its around day 6 your risk brain heamorage (this increases with each hour)

yes a lack of sleep will kill you.
not to mention you would end up a gibbering wreck by the end of it

study found that sleep deprivation or disruption, such as shift work, can seriously affect the body's ability to think clearly and accurately and to move or react normally.

They suggest that staying awake for 18 hours without sleep can be the same as drinking to the legal limit.

It found that people who habitually slept for five hours had 15% more ghrelin, a hormone which increases feelings of hunger, than those who slept for eight hours.

Those who slept for less time were also found to have 15% less leptin, a hormone which suppresses appetite.

"These differences are likely to increase appetite and, in societies where food is readily available, this may contribute to obesity," Dr Taheri said.

another

One of the possible side effects of a continued lack of sleep is death. Usually this is the result of the fact that the immune system is weakened without sleep. The number of white blood cells within the body decreases, as does the activity of the remaining white blood cells. The body also decreases the amount of growth hormone produced (8). The ability of the body to metabolize sugar declines, turning sugar into fat. One study stated that people who sleep less than four hours per night are three times more likely to die within the next six years (11). Although the longest a human has remained awake was eleven days rats that are continually deprived of sleep die within two to five weeks, generally due to their severely weakened immune system (10), (11), (12).

Everyday: 4-5 hours, excluding a 30 minutes nap in the weekdays!

here's some more

As a cause of diabetes

A 1999 study by the University of Chicago Medical Center shows that sleep deprivation severely affects the human body's ability to metabolize glucose, which can lead to early-stage diabetes.
[edit]

Effects on the brain

A 2000 study by the UCSD School of Medicine and the Veterans Affairs Healthcare System in San Diego, used functional magnetic resonance imaging (fMRI) technology to monitor activity in the brains of sleep-deprived subjects performing simple verbal learning tasks. The study showed that regions of the brain’s prefrontal cortex (PFC) displayed more activity in sleepier subjects. Depending on the task at hand, in some cases the brain attempts to compensate for the adverse effects caused by lack of sleep. The temporal lobe, which is a brain region involved in language processing, was activated during verbal learning in rested subjects but not in sleep deprived subjects. The parietal lobes, not activated in rested subjects during the verbal exercise, was more active when the subjects were deprived of sleep. Although memory performance was less efficient with sleep deprivation, greater activity in the parietal region was associated with better memory.

The UK reality show Shattered aired in 2004, contestants had to endure seven days with very little sleep. The effects of sleep deprivation on the brain were captured on 24/7 cameras. The show is considered the most well known sleep deprivation experiment to date.
[edit]

Effects on growth

According to a study by Alexandros N. Vgontzas, George Mastorakos, Edward O. Bixler, Anthony Kales, Philip W. Gold & George P. Chrousos, published in Clinical Endocrinology, Volume 51 Issue 2 Page 205, August 1999: Sleep deprivation results in a significant reduction of cortisol secretion the next day and this reduction appears to be, to a large extent, driven by the increase of slow wave sleep during the recovery night. Deep sleep has an inhibitory effect on the HPA axis while it enhances the activity of the GH axis. In contrast, sleep disturbance has a stimulatory effect on the HPA axis and a suppressive effect on the GH axis. These results are consistent with the observed hypocortisolism in idiopathic hypersomnia and HPA axis relative activation in chronic insomnia. Finally, our findings support previous hypotheses about the restitution and immunoenhancement role of slow wave (deep) sleep.
[edit]

Impairment of ability

According to a 2000 study published in the British scientific journal Occupational and Environmental Medicine, researchers in Australia and New Zealand reported that sleep deprivation can have some of the same hazardous effects as being drunk. Getting less than 6 hours a night can affect coordination, judgment and reaction time. People who drove after being awake for 17–19 hours performed worse than those with a blood alcohol level of .05 percent, which is the legal limit for drunk driving in most western European countries (most U.S. states set their blood alcohol limits at .08 percent). The study stated that 16 to 60 percent of road accidents involve sleep deprivation. Beyond impaired motor skills, people who get too little sleep may have higher levels of stress, anxiety and depression, and may take unnecessary risks.
[edit]

As a cause of obesity

A 2005 large study of a nationally representative sample of about 10,000 adults, suggested that the U.S.' obesity epidemic might have as one of its causes a corresponding decrease in the average number of hours that Americans are sleeping. Some scientists speculate that this might be happening because sleep deprivation might be disrupting hormones that regulate appetite. The study found that people between the ages of 32 and 49 who sleep less than 7 hours a night are significantly more likely to be obese. Other scientists hold that the physical discomfort of obesity and related problems, such as sleep apnea, reduce an individual's chances of getting a good night's sleep.
[edit]

As a treatment for depression

Recent studies show sleep deprivation has some potential in the treatment of depression. 60% of patients, when sleep-deprived, show immediate recovery, with most relapsing the following night. The incidence of relapse can be decreased by combining sleep deprivation with medication [1]. Incidentally, many tricyclic antidepressants happen to suppress REM sleep, providing additional evidence for a link between mood and sleep [2].
[edit]

Prevention of effects in soldiers

Since sleep deprivation is a fact of modern combat, the U.S. army, through DARPA, has a "Preventing Sleep Deprivation Program", which has the goal to prevent the harmful effects of sleep deprivation and provide methods for recovery of function with particular emphasis on cognitive and psychomotor impairments. Their efforts include new pharmaceuticals that enhance neural transmission, nutraceuticals that promote neurogenesis, cognitive training, and devices such as transcranial magnetic stimulation.