Today would have been John Keats’ 226th birthday. He died at age 25 of tuberculosis. Like many poets, he became famous after his death & by the early 1900s, he was one of the best-loved poets of the English language.
I studied Keats, among other poets, in an English Romanticism class I took in 2009 when I was pursuing my Bachelor’s Degree in English at the State University of New York at Buffalo. This poem is from the Keats text we used in that class.

References
Keats, John. “Sonnet. – To Sleep”. Keat’s Poetry and Prose. Selected and Edited by Jeffrey N. Cox. NY: Norton & Company, Inc., 2009. poem is found on page 346.