For they cannot sleep unless they have done evil; their sleep is stolen from them unless they make someone stumble.
In context
14Do not enter the path of the wicked, and do not walk in the way of evil men. 15Avoid it, do not pass along it; turn away from it and go on. 16For they cannot sleep unless they have done evil; their sleep is stolen from them unless they make someone stumble. 17For they eat the bread of wickedness and drink the wine of violence. 18But the path of the righteous is like the light of dawn, growing brighter and brighter until full day.