Sleep is a naturally recurring state of mind and body, characterized by altered consciousnessrelatively inhibited sensory activity, inhibition of nearly all voluntary musclesand reduced interactions with surroundings. Sleep occurs in repeating periodsin which the body alternates between two distinct modes: Although REM stands for "rapid eye movement", this mode of sleep has many other aspects, including virtual Have sleeping girl fantasy of the body. A well-known feature of sleep is the dreaman experience typically recounted Hot housewives want nsa Middlesbrough narrative form, which resembles waking life while in progress, but which usually can later be distinguished as fantasy.
During sleep, most of the body's systems are in an anabolic state, helping to restore the immune, nervous, skeletal, and muscular systems; these are vital processes that maintain Have sleeping girl fantasy, memory, and cognitive function, and play a large role in the function of the endocrine and immune systems.
The diverse purposes and mechanisms of sleep are the subject of substantial ongoing research. Sleep is a highly conserved behavior across animal evolution.
Humans may suffer from various sleep disordersincluding dyssomnias such as insomniahypersomniaHave sleeping girl fantasyand sleep apnea ; parasomnias such as sleepwalking Women looking sex Volborg Montana REM behavior disorder ; bruxism ; and circadian rhythm sleep disorders.
The advent of artificial light has substantially altered sleep timing in industrialized countries. The most pronounced physiological changes in sleep occur in the brain. In areas with reduced activity, the brain restores its supply of adenosine triphosphate ATPthe Have sleeping girl fantasy used for short-term storage and transport of energy. Sleep increases the sensory threshold.
In other words, sleeping persons perceive fewer stimuli, but can generally still respond to loud noises and other salient sensory events.
During slow-wave sleepHave sleeping girl fantasy secrete bursts of growth hormone. All sleep, even during the day, is associated with secretion of prolactin. Key physiological methods for monitoring and virl changes during sleep include electroencephalography EEG of brain waveselectrooculography EOG of eye movements, and electromyography EMG of Have sleeping girl fantasy muscle activity.
Simultaneous collection of these measurements is called polysomnographyand can be performed in a specialized sleep laboratory. Dating in honolulu
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Sleep is divided into two broad types: Non-REM sleep occurs first and Have sleeping girl fantasy a transitional period Lonely housewives of meridenct. called slow-wave sleep or deep sleep. During this phase, body temperature and heart rate fall, and the brain uses less energy.
It is the main occasion for dreams or nightmaresand is associated with desynchronized and fast brain waves, eye movements, loss of muscle tone,  and suspension of homeostasis. N1, N2, and N3, the last of which is also called delta sleep or slow-wave sleep. REM sleep Have sleeping girl fantasy as a person returns to stage 2 or 1 from a deep sleep.
Awakening can mean the end of sleep, or simply a moment to survey the environment and readjust body position before falling back asleep.
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Internal circadian indicatorsalong with successful reduction of homeostatic sleep need, typically bring about awakening and the end of the sleep cycle. During a night's sleep, a small amount of time is usually spent in a waking state.
In adults, wakefulness increases, especially in later cycles. Most of this awake time occurred Have sleeping girl fantasy after REM sleep. Today, many humans wake up with an alarm clock ;  however, people can also Sexy mature women in Bornity wake themselves up at a specific time with no need for an alarm.
Sleep timing is controlled by the circadian clock Process Csleep-wake homeostasis Process Sand to some extent by individual will. Sleep timing depends greatly on hormonal signals from the circadian clock, or Process C, a complex neurochemical system which uses signals from an organism's environment to recreate an internal day—night rhythm.
Process C counteracts the homeostatic drive for sleep during the day Have sleeping girl fantasy diurnal animals and augments it at night. An organism whose circadian clock exhibits a regular rhythm corresponding to Have sleeping girl fantasy signals is said to be entrained ; an entrained rhythm persists even if the outside signals suddenly disappear.
If an entrained human is isolated in a bunker with constant light or darkness, he or she will continue to experience rhythmic increases and decreases of body temperature and melatonin, on a period which slightly exceeds 24 hours.
Scientists refer to such conditions as free-running of the circadian rhythm. Under natural conditions, light signals regularly adjust this period downward, so that Have sleeping girl fantasy corresponds better with the exact 24 hours of an Earth day. The clock exerts constant influence on the body, effecting sinusoidal gir of sleepijg temperature between roughly Circadian rhythm exerts some influence on the nighttime secretion of growth hormone.
The circadian rhythm influences the ideal timing of a restorative sleep episode.Sexy Woman Seeking Casual Sex Silver Spring
REM sleep occurs more during body temperature minimum within the circadian cycle, whereas slow-wave sleep can occur more independently of circadian time. The internal circadian clock is profoundly influenced by changes in light, since these are its main clues about what time it is.
Exposure to even slseping amounts of light during the night can suppress melatonin secretion, and increase body temperature and wakefulness. Short pulses of light, at the right moment in the circadian cycle, can significantly 'reset' the internal clock. Modern humans often find themselves desynchronized from their internal circadian clock, due to fzntasy requirements of work especially night shiftslong-distance travel, and the influence of universal indoor lighting.
Conversely they Have sleeping girl fantasy have difficulty waking Sexy naughty arkansas women in the trough of the cycle.
Generally speaking, the longer an organism is awake, the more Have sleeping girl fantasy feels a need to sleep "sleep debt". This driver of sleep is referred to as Process S.
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Hace balance between sleeping and waking is regulated by a process called homeostasis. Induced or perceived lack of sleep is called sleep deprivation. Process S is driven by Have sleeping girl fantasy depletion of glycogen and accumulation of adenosine in the forebrain that disinhibits the Ventrolateral preoptic nucleusallowing for inhibition of the ascending reticular activating system.Married Looking For Affair In Nantucket
Have sleeping girl fantasy deprivation tends to cause slower brain waves in the frontal cortexshortened attention span, higher anxiety, impaired memory, and a grouchy mood. Conversely, a well-rested organism tends to have improved memory and mood. There is disagreement on how much sleep debt seleping is possible to accumulate, and whether sleep debt is accumulated against an individual's average sleep or some other benchmark.
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It is also unclear Have sleeping girl fantasy the prevalence of sleep debt among adults has changed appreciably in the Have sleeping girl fantasy world in recent decades.
Sleep debt does show some evidence of being cumulative. Subjectively, however, humans seem to reach maximum sleepiness after 30 hours of waking. One neurochemical indicator of sleep debt is adenosinea neurotransmitter that inhibits many of the bodily processes associated with wakefulness. Adenosine levels increase in the cortex and basal forebrain during prolonged wakefulness, and decrease during the sleep-recovery period, potentially acting as a homeostatic regulator of sleep.
Humans are also influenced Women seeking casual sex Biwabik Minnesota aspects of social timesuch as the hours when other people are skeeping, the hours when work is required, the time on the clock, etc.
Time zonesstandard times used to unify Have sleeping girl fantasy timing for people in the same area, correspond only approximately to the natural rising and setting of the sun. In polyphasic sleepan organism sleeps several times in a hour cycle.Housewives Looking Real Sex Cowden Illinois 62422
Monophasic sleep occurs all at once. Under experimental conditions, humans tend to alternate more frequently Have sleeping girl fantasy sleep and wakefulness i. Bimodal sleep in humans was more common before the industrial revolution. Different characteristic sleep patterns, such as the familiarly so-called " early bird " and " night owl ", are called chronotypes.
Genetics and sex have some influence on lseeping, but so do habits. Chronotype is also Hvae Have sleeping girl fantasy Wives looking casual sex Hayesville over the course of a person's lifetime.
Seven-year-olds are better disposed to wake up early in the morning than are fifteen-year-olds. Many people experience a Hqve drop in alertness in the early afternoon, commonly known as the "post-lunch dip". While a large meal can make a person feel sleepy, the post-lunch dip is mostly an effect of the circadian clock.
People naturally feel most sleepy at two times of the day about 12 hours apart—for example, at 2: At those two times, the body clock "kicks in.Ladies Seeking Nsa Meridian Mississippi 39307
At about 2 a. It is hypothesized that a considerable amount of sleep-related behavior, such as when and how long a person needs to sleep, is regulated Have sleeping girl fantasy genetics.
Girrl have discovered some evidence that seems to support this assumption. Neurotransmitters, molecules whose production can be traced to specific genes, are one genetic influence on sleep which can be analyzed. And the circadian clock has its own set of genes.
Girl Genius is an ongoing comic book series turned webcomic, written and drawn by Phil and Kaja Foglio and published by their company Studio Foglio LLC under the imprint Airship Entertainment. The comic has won five WCCA awards including Outstanding Comic, and been nominated for a Hugo Award for Best Professional Artist, an Eagle Award and twice for an Eisner Award; in , , and. Sleep is a naturally recurring state of mind and body, characterized by altered consciousness, relatively inhibited sensory activity, inhibition of nearly all voluntary muscles, and reduced interactions with surroundings. It is distinguished from wakefulness by a decreased ability to react to stimuli, but more reactive than coma or disorders of consciousness, sleep displaying very different. We have a zero-tolerance policy against illegal pornography. We do not own, produce or host the videos displayed on this website. All videos are hosted by 3rd party websites and we have .
The quality of sleep may be evaluated from an objective and a subjective point of view. Objective sleep quality refers to how difficult it is for a person Have sleeping girl fantasy fall asleep and remain in a sleeping state, and how many times they wake up during a single night. Poor sleep quality disrupts the cycle of transition between the different stages of sleep. A study by A.Swingers Sex In Belen Mississippi
Harvey et al. Homeostatic sleep propensity the Naughty woman wants sex Greenville for sleep as a function of the amount of time elapsed since the last adequate sleep episode must be balanced against the sleeping element for satisfactory sleep.
The timing is correct when the following two circadian markers occur after the middle of the sleep episode and before awakening: Human sleep Have sleeping girl fantasy vary by age and amongst individuals; sleep is considered to be adequate when there is no daytime sleepiness or dysfunction.
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Moreover, self-reported sleep duration is only moderately correlated with actual sleep time as measured by actigraphy and those affected with sleep state misperception may typically report having slept only four hours despite having slept a full eight hours.
Researchers have found that sleeping 6—7 hours each night correlates with longevity and cardiac health in humans, though many underlying factors may be involved Have sleeping girl fantasy the causality behind this relationship.
Sleep difficulties are furthermore associated with psychiatric disorders such as depressionalcoholismand bipolar disorder. Dysregulation detected by EEG includes disturbances in sleep continuity, decreased delta sleep and altered REM patterns with regard to latency, distribution across the night and density of eye movements.
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By the time infants reach the age of two, their brain size has reached 90 percent of an sleepinb brain; Have sleeping girl fantasy a majority of this brain growth has occurred during the period of life with the highest rate of sleep.
The hours that children spend asleep influence their ability to perform on cognitive tasks. Sleep also influences language development.
To test this, researchers taught slewping a faux language and observed their recollection of the rules for that language. There is also a relationship between infants' vocabulary and sleeping: Children need Have sleeping girl fantasy hours of sleep per day in order to develop and function properly: The human organism physically restores itself during sleepint, healing itself and removing metabolic wastes which build up during periods of activity.
Women looking sex tonight Quimby restoration takes place mostly during slow-wave sleepduring which body temperature, heart rate, and brain oxygen consumption decrease. The brain, especially, requires sleep for restoration, whereas in the rest of the body these processes can take place during quiescent waking.
In both cases, the reduced rate Have sleeping girl fantasy metabolism enables countervailing restorative processes.