'Cribs'에 해당되는 글 39건

  1. 2007.07.11 F. Kafka - Raban
  2. 2007.07.08 This is for you
  3. 2007.07.05 The Science of Sleep
  4. 2007.06.28 January 16, 1922

F. Kafka - Raban

Cribs 2007.07.11 00:46
From the "Wedding Preparations"

And what is more, can't I do what I always did in dangerous undertakings as a child? I don't even need to go to the country myself; that isn't necessary. I'll send my fully clothed body. If it goes out the door of the room falteringly, this faltering is not a sign of fear but a sign of its nothingness. Furthermore, it is not excitement that causes my body to stumble on the stairs when it travels to the country, sobbing, eating its evening meal there in tears. For I, I shall meanwhile be lying in my bed, smoothly covered with my yellowish-brown quilt, getting the breeze that blows through the room from the slightly open door. The coaches and people on the street ride and walk hesitantly over the smooth, bare ground, for I am still dreaming. The coachmen and the people walking are shy and, looking at me, they ask my permission before each step they are about to take. I encourage them, and they do not encounter any obstacle. Lying in bed, I have the form of a large beetle. I would carry on then as if it were a matter of my hibernating - and I press my little legs against my bulging body. And I murmur a small number of words - those are instructions to my sorrowing body that is standing quite near me, leaning low over me. Before long I am through - my body bows, flits away, and will accomplish everything to best advantage while I rest.
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This is for you

Cribs 2007.07.08 00:56

"He who knows nothing, loves nothing. He who can do nothing understands nothing. He who understands nothing is worthless. But he who understands also loves, notices, sees... The more knowledge is inherent in a thing, the greater the love... Anyone who imagines that all fruits ripen at the same time as the strawberries knows nothing about grapes."  -  Paracelsus

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The Science of Sleep

Cribs 2007.07.05 00:29

From the BBC Science & Nature website

We spend a third of our lives doing it.
Napoleon, Florence Nightingale and Margaret Thatcher got by on four hours a night. Thomas Edison claimed it was waste of time.

Why do we sleep?
So why do we sleep? This is a question that has baffled scientists for centuries and the answer is, no one is really sure. Some believe that sleep gives the body a chance to recuperate from the day's activities but in reality, the amount of energy saved by sleeping for even eight hours is miniscule - about 50 kCal, the same amount of energy in a piece of toast.
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.

What would happen if we didn't sleep?
A good way to understand the role of sleep is to look at what would happen if we didn't sleep. Lack of sleep has serious effects on our brain's ability to function. If you've ever pulled an all-nighter, you'll be familiar with the following after-effects: grumpiness, grogginess, irritability and forgetfulness. After just one night without sleep, concentration becomes more difficult and attention span shortens considerably.
With continued lack of sufficient sleep, the part of the brain that controls language, memory, planning and sense of time is severely affected, practically shutting down. In fact, 17 hours of sustained wakefulness leads to a decrease in performance equivalent to a blood alcohol level of 0.05% (two glasses of wine). This is the legal drink driving limit in the UK.
Research also shows that sleep-deprived individuals often have difficulty in responding to rapidly changing situations and making rational judgements. In real life situations, the consequences are grave and lack of sleep is said to have been be a contributory factor to a number of international disasters such as Exxon Valdez, Chernobyl, Three Mile Island and the Challenger shuttle explosion.
Sleep deprivation not only has a major impact on cognitive functioning but also on emotional and physical health. Disorders such as sleep apnoea which result in excessive daytime sleepiness have been linked to stress and high blood pressure. Research has also suggested that sleep loss may increase the risk of obesity because chemicals and hormones that play a key role in controlling appetite and weight gain are released during sleep.

What happens when we sleep?
What happens every time we get a bit of shut eye? Sleep occurs in a recurring cycle of 90 to 110 minutes and is divided into two categories: non-REM (which is further split into four stages) and REM sleep.

Non-REM sleep
Stage one: Light Sleep
During the first stage of sleep, we're half awake and half asleep. Our muscle activity slows down and slight twitching may occur. This is a period of light sleep, meaning we can be awakened easily at this stage.

Stage two: True Sleep
Within ten minutes of light sleep, we enter stage two, which lasts around 20 minutes. The breathing pattern and heart rate start to slow down. This period accounts for the largest part of human sleep.

Stages three and four: Deep Sleep
During stage three, the brain begins to produce delta waves, a type of wave that is large (high amplitude) and slow (low frequency). Breathing and heart rate are at their lowest levels.
Stage four is characterised by rhythmic breathing and limited muscle activity. If we are awakened during deep sleep we do not adjust immediately and often feel groggy and disoriented for several minutes after waking up.

REM sleep
The first rapid eye movement (REM) period usually begins about 70 to 90 minutes after we fall asleep. We have around three to five REM episodes a night.
Although we are not conscious, the brain is very active - often more so than when we are awake. This is the period when most dreams occur. Our eyes dart around (hence the name), our breathing rate and blood pressure rise. However, our bodies are effectively paralysed, said to be nature's way of preventing us from acting out our dreams.
After REM sleep, the whole cycle begins again.

How much sleep is required?
There is no set amount of time that everyone needs to sleep, since it varies from person to person. Results from the sleep profiler
indicate that people like to sleep anywhere between 5 and 11 hours, with the average being 7.75 hours.
Jim Horne from Loughborough University's Sleep Research Centre has a simple answer though: "The amount of sleep we require is what we need not to be sleepy in the daytime."

Even animals require varied amounts of sleep:

Species Average total sleep time per day
Python 18 hrs
Tiger 15.8 hrs
Cat 12.1 hrs
Chimpanzee 9.7 hrs
Sheep 3.8 hrs
African elephant 3.3 hrs
Giraffe 1.9 hr

The current world record for the longest period without sleep is 11 days, set by Randy Gardner in 1965. Four days into the research, he began hallucinating. This was followed by a delusion where he thought he was a famous footballer. Surprisingly, Randy was actually functioning quite well at the end of his research and he could still beat the scientist at pinball.

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January 16, 1922

Cribs 2007.06.28 00:14
"...breakdown, impossible to sleep, impossible to stay awake, impossible to endure life, or, more exactly, the course of life. The clocks are not in unison; the inner one runs crazily on at a devilish or demoniac or in any case inhuman pace, the outer one limps along at its usual speed. What else can happen but that the two worlds split apart, and they do split apart, or at least clash in a fearful manner."

- Franz Kafka, diary entry
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