This escapist activity is fine for slackers, but idlers must resist it! As Simone Weil noted, although the imagination can be a powerful tool for liberation, the daydreamer ["dream" is from an Indo-European word meaning "deception"] may be tempted into "filling up the void with compensatory illusions." On a less philosophical level, the painter Delacroix insisted that the imagination "remained impotent and sterile if it was not served by a resourceful skill which could follow it in its restless and tyrannical whims." Don't daydream, then: Dream, and follow your dreams, instead. See: ABSENTMINDED, DREAMER, FORGETFUL.

Daydreamer was a popular song by David Cassidy.

someone who indulges in idle or absent-minded daydreaming

One given to daydreams.