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Cortisol is a hormone which regulates the level of need for sleep. The lower level of cortisol warning when it's time for sleep, and when it reaches the required level, it gives a signal that it is the time to wake up. During sleep, we pass through several phases, with identifiable so called "REM" and "N-REM stage. Both are made from several sub phases.

REM phase (Rapid Eye Movement) is phase of slow sleep, in which we spend 20-25% of sleep, there is a 1.5 hour after falling asleep. Measurements showed that for every 1.5 h, this phase is repeated. Characteristics of REM stages are: the eyes move quickly from side to side, the brain is very active in this phase and is easy to wake, but also easy to fall asleep, dream, we collect energy for the brain and body, and for a variety of routine activities. As the muscles relax, the body becomes "stiff".

"N-REM, in contrast to REM phase, is the phase of deep sleep. The brain is less active, but increases the activity of the body, due to increased secretion of hormones and circulation. During this phase restores the tissue. "N-REM stage of deep and refreshing sleep makes 75% of sleep.

It is characterized by four sub phases: 1. Half-wake state 2. Beginning of sleep, we begin to breathe evenly; the same is with the pulse. Body temperature decreases, indicating that the sleeping rooms should be chilly a few degrees of the study. 3/4. Deep sleep - breathing and heart rate to slow down, muscles relax and renew the tissues, and that is if the mattress is "comfortable". Muscles are resting only when relaxed, making it necessary to have anatomic mattress. The brain is less active, but increases the activity of the body due to increased secretion of hormones and circulation.

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