I've been noticing recently that everything good has some bad effect, ive been thinking about this a long time, and then realized something...newtons third(?) law(Which I never really understood, if it exerts an equal force in my direction, then how will a bow that I puch move?) states that every action has an equal and opposite reaction, and dream control and such seems great, so are there any horrible side effects(Other than the chance of having a bad dream )?