I was very worried about doing them for that reason. But they don't bother my sleep, even if I do them in the evening now.
The coffee is supposed to do straight to the liver and not into general circulation. However, I did need to start out a little weak (1/2 teaspoon) for a few days.
So all things considered, they are overall very helpful. Although they may stimulate a little...it is worth it considering how powerful it is to remove toxins