"The Cuban Doctor" is a poem from Wallace Stevens's first book of poetry, Harmonium. It was first published in the journal Poetry in October 1921, so it is in the public domain.
The1 poem meditates on Stevens's increasing awareness, also notably expressed in "The Anecdote of the Prince of Peacocks" (1923), that the difference between imaginative activity and ordinary experience is unstable and affected by irrational forces, which may attack, like a bolt of lightning, even someone "drowsing in summer's sleepiest horn". This theme can be understood as signalling that writing poetry is dangerous. Poetic drowsing is liable to attack by the Indian, or by Berserk in "Peacocks", defeating imagination's task of transforming the ordinary. This sense of danger is absent in such earlier poems as "Disillusionment of Ten O'Clock" (1915), where the old sailor need fear no such violence as he catches tigers in red weather.