I have not tried the polyphasic experiment, but if I ever take a nap during the day, I do experience time dilation. Even if I am to wake up in the morning, and go back to sleep, I seem to have a dream almost every time I sleep and it feels like at least an hour, but the dream is 20 minutes or less. I wake up 20 minutes later, and it seems like so much more time has passed. So this "time dilation" may not just be a side-effect of polyphasic sleep, but maybe napping in general. I am just going on my own experiences.
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