is there any evidence that we used to sleep in polyphasic patterns? This is new info to me, but I do know that biologically we still adhere to a 24 hour night-day rhythm, even in the absence of physical stimuli. So what I'm saying is, I'm very doubtful that humans ever slept like this, unless consciously done so.
That being said, I also know that the first settling europeans had what they called "second sleep" during the winter, where they would wake up at one point in the night for a few hours, do things by candlelight, then go back to bed. This was a direct result of shorter days, however, so it was still a response to circadian rhythm.
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