"The first work to treat the dream as an object of psychology seems to be Aristotle’s"

    The philosopher Aristotle wrote three essays on sleep and dreaming.  In the one quoted here, On Prophesying by Dreams, he dismisses the magical properties often attributed to sleeping visions, arguing that their value lies not in divining the future, but revealing the inner life of the sleeper.  By beginning his treatise with an appeal to one of the revered forefathers of modern thought, Freud moves swiftly to distance himself from the taint of disreputable occultism surrounding the interpretation of dreams.

 

Online edition of Aristotle’s 'On Dreams', as translated by J.I. Beare (mid-4th century BC)

Online edition of Aristotle’s 'On Sleep and Sleeplessness', as translated by J.I. Beare (mid-4th century BC)

Online edition of Aristotle’s 'On Prophesying by Dreams', as  translated by J.I. Beare (mid-4th century BC)