My iPhone5 won't automatically go to sleep, where is the setting?

My iPhone5 will not go to sleep unless I press the button at the top.  Otherwise, it remains on, which is draining the battery prematurely.  Is there something wrong with it or is it a setting?  I've looked all over and can't find anything in the settings. 

That was it, thank you SO much!  I saw the "auto lock" function, but did not put that together with what I was looking for.  I didn't think of it as a "locking" problem.  Again, a huge thank you!

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    Message was edited by: CS

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