I highly doubt the effectiveness of polyphasic sleep. I myself found myself physically fatigued when I tried something like that.

So, based on my own (little) experience, my muscles need the long rest that a good night's sleep gives.

And doing "something useful" while commuting... Well ain't there a sure sign for disaster?

Hmm. Now don't get me wrong, but your post seems to be coming from a guy who's heading enthusiastically straight into a total mental burndown...