1st of all the SWF is to be done on an empty system 1st thing in the morning. Doing it at night you would be washing away your days nutrition and components of the MC that work to continue to cleanse while you sleep.
The Psyllium has never been part of the MC and it really isn't a good idea to do on it. Go to the top of the page to the FAQs and the 1st post in the FAQs will be "Ultimate Cleanse (BPs)" BP stnds for Bentonite and Psyllium but it will still apply to the just doing the Psyllium while MCing