Smooth Move has senna in it. It has other great stuff in it, but the laxative action is from senna alone.
I can't remember why the Master-Cleanse book says no enemas. Darnit, it's been years since I first read it! Maybe someone else can clarify. I go ahead and do them every-other day, or just 2x a week, when I fast. When I'm done iwth the fast I take care to eat a diet that will replace/aid bowel flora.
If you do an enema you really don't need to do an SWF, it's the same thing, except the SWF (Salt-Water-Flush) flushes more of the digestive tract than an enema can.
Lordy, of course do what you need to sleep thru the night! :) I time things so that I go in the morning, sleepy-time BMs are quite out of the question! sheesh! :)