1.What cells of the human body are the thinnest?

2. When the pocess of braking starts?

3. What is essential for the human brain to function non stop?

4. After what phisical process human falls asleep ?

5. Due to what condition nerve system is restoring its ability to function?

6. What is the most important meaning of sleep for the human?

7. How long is the lenght of a sleep in general?

8. What the vast researches and experiments showed?

9. What processes in human body take place during undisturbed sleep?

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