After a tranquil sleep...

After a tranquil sleep, study progresses very quickly and mental activity and physical endeavors are often more successful. These facts show the important functional role of sleep in Man's life. There are few tortures, for a person, that are as painful as compulsory sleeplessness. Experiments have shown that Man's tolerance for lack of sleep is very little and soon he loses his health and becomes sick. The aforementioned…