I've done one day flush and over 25 night flushes. I have to say that sleeping through it is the best thing you can do. I had such nausea and pains that I will never do it again. When Dr. Hulda Clark s says, "Don't forget the ornithine or you could have the worst night of your life." she wasn't kidding! Ornithine makes you sleep through it and that's exactly what I recommend. Others on this site have done it and don't have a problem, but I did.