Ially sunlight or other bright lights.
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The most noticeable feature of circadian rhythms is the sleep/wake cycle.
But there are other circadian rhythms including swings in many hormones throughout the day and night, the body temperature cycle, appetite and the best times of alertness and productivity.
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Ideally these rhythms are in sync with each other and with the light-dark cycle in nature, the norm being wakefulness during daylight hours and sleep during darkness.
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So for example normal adults usually go to sleep between 10 pm and 1 am and awaken 7-8 hours later with no problem. bath tub viagra commercial Some people are flexible and can adjust to sleeping on practically any shift.
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Still, they may prefer to wake up early (such people are often called "morning larks") or stay up late ("night owls").
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Other people cannot adjust, and sleeping at the wrong time can make them ill. cheap viagra pills These people have circadian sleep disorders.
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Circadian rhythm sleep disorders chronic circadian rhythm sleep disorders are internal (endogenous, or built-in) abnormalities of the circadian rhythms, the body's internal clock. yahoo email virus viagra They arise when a person is unable to fall asleep at a normal bedtime (late evening), although he/she is able to sleep at other times. cheap viagra pills The length of the internal circadian cycle can normally be a bit shorter or longer than 24 hours. cheap viagra pills The cycle is entrained to 24 hours by external factors, especially light.
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If it cannot be entrained, either because it is too far afield of the normal range, or for other neurological reasons, the result is a circadian disorder.
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In these disorders, the internal coordination of the various rhythms may also be normal or faulty.
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For example, some hormones may be on a different cycle than others. viagra women recreational use Common to these disorders is inflexibility: even when physically tired or sleep deprived, sufferers cannot make up for lost sleep outside of their hard-wired sleep times.
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This factor is generally misunderstood by people who do not suffer from these disorders, leading to misunderstanding of what sufferers are up against, and a conclusion that they are just lazy or haven't tried hard enough to live on a normal schedule.
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The international classification of diseases 2009 (icd-9) lists 6 subtypes of circadian rhythm sleep disorder: delayed sleep phase type free-running type advanced sleep phase type irregular sleep-wake type jet lag type shift work type as well as unspecified, other, and conditions specified elsewhere. which pill is better viagra or viagra The dsm-iv defines circadian rhythm sleep disorder as follo.
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