כִּ֛י בָּ֥א הַחֲל֖וֹם בְּרֹ֣ב עִנְיָ֑ן וְק֥וֹל כְּסִ֖יל בְּרֹ֥ב דְּבָרִֽים׃
Footnotes to Kohelet by Bruce Heitler
Literally, "A dream comes with too much activity." This could refer to unrealistic ambition, fantasy which is encouraged by narrow-minded involvement with all the activity, or any other kind of loss of contact with hard reality.