Samuel Taylor Coleridge, being one of my favorite poets of all time, and one of the most famous, actually dreamed a mythical vision after using drugs(opium). During that surreal visions he made up an entire poem (Named Kubla Khan) in his mind and upon waking up from that state, he immediately started writing it down. While he was busy composing the poem, a person from Porlock (https://en.wikipedia.org/wiki/Person_from_Porlock
) interrupted him, making him to lose the grasp on the poem. After returning from that interruption he couldn't finish the poem. When John Livingston Lowes taught the poem, he told his students "If there is any man in the history of literature who should be hanged, drawn, and quartered, it is the man on business from Porlock."
What I really love about this poem, apart from the description of those mythical visions which STC put in to words masterfully, is the last part of the poem where I believe is a reference to the process of losing the visions of that dream. A regret, an ode to a lost memory, a deep nostalgia that forgot. Something we can all relate to.
(the last part of the poem):
A damsel with a dulcimer
In a vision once I saw:
It was an Abyssinian maid,
And on her dulcimer she played,
Singing of Mount Abora.
Could I revive within me
Her symphony and song,
To such a deep delight 'twould win me
That with music loud and long,Post too long. Click here to view the full text.