I just had "to procedure" last week. I actually had a prescprtion where I took two pills at 5 p.m. (can't remember the name) and drank a bunch of this solution for the next 4 hours. All in all...the worst of it was over by midnight, but still woke up throughout the night. However, I did still have to drink a small amount of laxative in the morning. Unfortunatly, it just seems like the routine for the "cleansing". Make sure you don't have anything going on after the procedure so you can just eat and rest afterward.