For they (f) sleep not, except they have done mischief; and their sleep is taken away, unless they cause [some] to fall.
(f) Meaning that to do evil is more proper and natural to the wicked than to sleep, eat or drink.
Related Commentaries of Proverbs 4:16
Proverbs 4:16
16 For they sleep not, except they have done mischief; and their sleep is taken away, unless they cause some to fall.