Everyone needs rest. Todlers need 12 hours of sleep and adults about 8 hours. Still the period when we sleep remains part mistery to humankind. But some aspects of sleep have already been revealed. Scientists discovered there are five stages:

• Stage 1- is of light sleep. If we were woken up at this stage we might not realize that we even slept at all.

• Stage 2- in this stage our brain waves are detectable and our heart beats are regular.

• Stage 3 and 4 - in these stages we are in deep sleep.Our heart pressure and breathing is slowed down.

Our muscles are relaxed. It is when we build up energy. In these stages hormones are released (even growth hormones that are essential for children).

• Stage 5- it is the last stage. In this stage dreams are created. It is also called REM sleep

Our brain continues to work even when we sleep. These are main 5 activities of the brain during sleep:

1. Making decisions - during an experiment the volunteers were asked to classify some words into categories. After that they went to sleep. The scientists who monitored them discovered that the subjects’ brain waves grew when they heard the words they had to classify.

They didn’t remember once woken up which means that the information was processed unconsciously.

2. Creating and consolidating memories. Sleep is the period when our brain assimilates the information received during the day. If you don’t get a good night sleep, the capacity to receive new information is decreased with 40%.

3. Creative connections. When a person gets a good night sleep they're 33% more likely to have surprising new ideas and solutions.

4. Release of toxins. Many studies made in 2013 showed that our brain releases neuro-toxins during sleep. The lack of sleep can lead to toxin accumulation and thus diseases such as Parkinson or Alzheimer can appear.

5. Loading tasks into memory. Our brain saves up new information in long term memory with the help of high-frequency brain pulses that take in REM sleep. Usually it’s about motion activities such as driving.

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