as for me..I overslept too much
A number of reason here
1) psychology - my parents would always wake up in the middle of the night and would be critisizing me. needless to say i have a strong motivation to just sleep and forget bout polyphasic.
2)the sleep schedule - might not be a good idea after all- I would have a hard time to sleep at night because i just slept like 2 hours ago!
I guess i'll have to wait until i quit my job.