(Pro 4:16) For they sleep not, except they have done mischief; and their sleep is taken away, unless they cause some to fall. (KJV)
Evil exists. It is not a case of making mistakes or being misguided. Some people cannot go to sleep because they are frustrated in evil doing. These people do not sin accidentally, they do so with focus and enthusiasm. We are surrounded by them. Christians, wake up! Compare this with Proverbs 6:14.