The sleep duration depends on the age: the younger the organism, the more time a person should sleep. People carrying out work related to the strong tension of the nervous system need to sleep longer. The long sleep is required for patients. To establish a good, quiet sleep, one should follow these rules: * Bedroom should be well aired, the temperature should provide a comfortable sleep, i.e. the room should be cool, and the bed should be warm; * Try to go to bed and get up...