Over at LessWrong (
http://lesswrong.com/lw/i3c/polyphasic_sleep_support_group/9fic?context=3) there's at the moment an interest in polyphasic sleep.
I posted a link to this group and someone found unable to register for this group.
I tried to verify registration problem with a secondary email address and they seem to be real.
I think it would be good if however control this group looks into making it easy for people to join it.