For a dream cometh through the multitude of business,.... Or, "for as a dream" , so Aben Ezra; as that comes through a multiplicity of business in the daytime, in which the mind has been busied, and the body employed; and this brings on dreams in the night season, which are confused and incoherent; sometimes the fancy is employed about one thing, and sometimes another, and all unprofitable and useless, as well as vain and foolish;and a fool's voice [is known] by multitude of words; either his voice in conversation, for a fool is full of words, and pours out his foolishness in a large profusion of them; or his voice in prayer, being like a man's dream, confused, incoherent, and rambling.
The supplement, "is known", may be left out.