i halfheartedly tried polyphasic once a few years ago and made it 32 hours. Polyphasic Sleep – One Year Later is an interesting summary of a guy who did it for 6 or so months. it just seems like it would be such a huge change, especially socially.

i've never had a solid sleep schedule although it's probably mainly behavioral than anything else. overall i always tend to feel most rested when i fall into a bi-phasic pattern of sleeping for 4 hours during the day and 4 hours at night. i also quite often feel the need to sleep for 12-14 hours some days, maybe because i'm lacking sleep, or maybe because i'm just fucking lazy.