posted on Nov, 13 2011 @ 01:31 PM
I have found that though we all have natural clocks within ourselves, we all use "time" differently. I happen to enjoy the circadian system
I have found that allowing my body to awaken when needed and sleep when needed has actually made me less stressed. This of course cannot be done by
all, depending on your job/school/lifestyle.
A circadian rhythm, popularly referred to as body clock, is an endogenously driven, roughly 24-hour cycle in biochemical, physiological, or
behavioural processes. Circadian rhythms have been widely observed in plants, animals, fungi and cyanobacteria (see bacterial circadian rhythms). The
term circadian comes from the Latin circa, meaning "around", and diem or dies, meaning "day". The formal study of biological temporal rhythms such
as daily, tidal, weekly, seasonal, and annual rhythms is called chronobiology. Although circadian rhythms are endogenous ("built-in",
self-sustained), they are adjusted (entrained) to the environment by external cues called zeitgebers, the primary one of which is daylight.
The reason why I thought this was great, is because it explains why some love to be up all night, and have no problem sleeping all day. Many think
this is laziness, but its not.
Daily and Circadian Rhythmicity
1. The Earth's rotation around its axis generates daily en- vironmental cycles. The most conspicuous daily environmental cycles are those of
ambient temperature and illumination. The daily environmental cycle of greatest importance to organisms is the alternation of light and darkness. A
civil day lasts 24.0 hours and includes a seasonally-variable interval of light (day), a variable interval of darkness (night), and two twilights
(dawn and dusk). Many human populational activities exhibit daily rhythmicity in synchrony with the civil day.
2. Biological processes that cycle in 24-hour intervals are called daily rhythms (or, less often, nycthemeral rhythms). When a daily rhythm is
endogenously generated, but still susceptible to modulation by 24-hour environmental cycles, it is called a circadian rhythm. Many behavioral
processes of individual organisms exhibit daily and/or circadian rhythmicity, including locomotor activity, feeding, excretion, sensory processing,
and learning capability. Rhythms of locomotor activity have been the most thoroughly-studied behavioral rhythms.
3. Many autonomic processes of individual organisms exhibit daily and/or circadian rhythmicity, including the control of body temperature,
cardiovascular function, melatonin secretion, cortisol secretion, metabolism, and sleep. Rhythms of body temperature have been the most
thoroughly-studied autonomic rhythms. The body temperature rhythm of a representative tree shrew (a small, primitive primate) is depicted in Figure 1.
Specific information about rhythmicity in human vital signs is available here.
There plenty more explanation on the page.