Yes, other stages are important. But during polyphasic sleeping, which is when you sleep more than once in a day, your sleep stages can get split too. We even have some scientific evidence for it. Though we still don&#x27;t understand it well. More within links here: <a href="http:&#x2F;&#x2F;qz.com&#x2F;430415" rel="nofollow">http:&#x2F;&#x2F;qz.com&#x2F;430415</a>.