Polyphasic sleep fail

Ever since I have tried to get onto a polyphasic sleep schedule my sleep schedule has been all over the place.  I don't seem to be able to sleep when I want to.  I'm not sure I am going to keep trying for this, although it will help when I go homeless at the end of July.  I'm going to give it one more shot.  Hopefully, things will get better this time around.