title: What is a practical use for PHP's sleep()?
body: <p>I just had a look at the docs on <a href="http://php.net/manual/en/function.sleep.php" rel="noreferrer"><code>sleep()</code></a>.</p>
  
  <p>Where would you use this function?</p>
  
  <p>Is it there to give the CPU a break in an expensive function?</p>
  
  <p>Any common pitfalls?</p>