Therefore, the process is dependent of the luminosity or the lack of it, thus it is initiated when putting of the sun, when becoming gloomy, as it was an acknowledgment to the organism to prepare itself to sleep. Whereas the adrenal gland liberates the hormone cortisol, that it informs and it prepares the organism for the vigil. If to measure the body temperature to each two or three hours throughout some days, will verify that it tends maximum values in the end of the afternoon and minimum values in the way of the night (…) This variation of temperature is verified same if the ambient conditions of luminosity and temperature to remain constant (LOUZADA and MENNA-BARRETO, 2007, P. 16). Then, with this inquiry, it is possible to evidence the existence of internal clocks that regulate our functions and that they are independent of the environment, the call Internal Secular Organization. We have an internal clock that in the awaken one and it makes in them to adormecer.
When the internal clock is indicating the period of vigil, the organism if it speeds up and its energy increases, what disfara the effect of behind sleep. However, when it points with respect to a slower period of training, the corporal processes lose rhythm and energy, exacerbando the effect of the debit of sleep (COREN, 1998, p.69). From this we come across in them with a great controversy in relation to the system of the biological clock, the what concerns the necessary amount of sleep to the individuals. It is important to clarify that this factor is sufficiently relative, since each person.