I&#x27;ve tried polyphasic sleep on a number of occasions over the past couple of decades, with a few different schedules. It doesn&#x27;t work (for me). Perpetual grogginess becomes the norm, and I always felt tired, occasionally short of breath and prone to heartburn (this one seems weird, but I get heartburn when I&#x27;m overly tired in normal circumstances, as well).<p>The best science I&#x27;ve been able to find on the subject seems to match that experience. Some people can &quot;feel fine&quot; on a polyphasic schedule, but in tests there does seem to be a decline in performance. Slower response times and less accuracy on hand-eye tests, etc. that is similar to the decline experienced by sleep deprived subjects.<p>I&#x27;d love to have several extra hours a day, but from what I can tell, there are trade offs that nullify the productivity and &quot;more time&quot; advantages.