Most people think of sleep as a time when the mind and body can rest after a day of activity. However, doctors know it's much more than that. Sleep is an active critical function. While sleeping, our mind processes and records information, while our body rejuvenates by growing muscle and repairing tissue. Sleep is necessary for a person's health and well being. What text structure is being used, description, compare and contrast, order and sequence, problem and solution and cause and effect.

compare and contrast.

Explanation:

The passage starts with a statement backed by popular opinion, "Most people think of sleep as a time when the mind and body can rest after a day of activity." After this it throws a curve ball giving a statement backed by fact, saying, "doctors know much more than that." The passage proceeds to explain what doctors know, which is comparing and contrasting, popular belief and fact.

This is pretty much the whole structure of this informational passage.  

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