The opium-induced sleep that inspired his "Kubla Khan" was an omen; he later became dependent on the drug
[DOC] [TLE] The Project Gutenberg EBook of Coleridge's Ancient Mariner and ... [PAR] A few weeks later he is back at Cambridge, tortured apparently between his old 
.... or philosophical acquirements, Coleridge's devotion to him and dependence 
on ..... his will; but the "indolence" was in him before he became addicted to 
opium, .... "The Pains of Sleep," a sort of contrast to "Kubla Khan" composed in 
1803.