However, in part for reasons of organizationalconvenience, modern societies are structured as if all humans had the same sleep requirements; and in many parts of the world there is a satisfying sense of moral rectitude in rising early. The amount of sleep required for buffer dumping would then depend on how much we have both thought and experienced since the last sleep period. Carl Sagan
About This Quote

During times of high stress, it is necessary to allow time for your body to restore itself. If you are constantly depriving yourself of sleep, you will become more exhausted and stressed out. However, it is also important that you do not go overboard. Too much sleep can lead to some unfortunate side effects such as feeling sluggish and unmotivated.

So, how much is enough? This amount varies from person to person, but generally speaking, individuals should aim for between ten and fifteen hours of sleep each night. However, this amount can vary depending on the individual's age and their particular circumstances.

Source: Dragons Of Eden: Speculations On The Evolution Of Human Intelligence

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