Does time.sleep help the processor?
<p>Recently I was surfing on Stack Overflow (Python) and saw <a href="https://stackoverflow.com/a/18406512/6063416">this post</a> where Aaron Hall claims that </p>

<blockquote>
  <p>constantly running while loops can consume a lot of processing power. Adding a sleep period (even only a second) can greatly reduce that usage.</p>
</blockquote>

<p>Is it really true? And if so, how come?  Does the same rule apply to other programming languages as well (i.e. C++)?</p>