This is my third day on the 3 naps 1 core sleep schedule.  It is still a bit of a struggle.  But I have a hypothesis about why fasting may combine well with polyphasic sleep.  It has to do with growth hormones.  They are released when we get deep sleep.  But, if we limit our deep sleep we may get less growth hormones and not be quite as healthy.  Interestingly enough there may be a way of increasing the release of growth hormone in a natural way through fasting.

I know of no studies.  So I cannot say what the net outcome will be.  But it seems to make sense.