Truman Capote (born Truman Streckfus Persons), author of In Cold Blood and Breakfast at Tiffany’s, never got out of bed to write, as he unabashedly confessed to an interviewer from The Paris Review: “I am a completely horizontal author. I can’t think unless I’m lying down, either in bed or stretched on a couch and with a cigarette and coffee handy. I’ve got to be puffing and sipping. As the afternoon wears on, I shift from coffee to mint tea to sherry to martinis. No, I don’t use a typewriter. Not in the beginning. I write my first version in longhand (pencil). Then I do a complete revision, also in longhand.” Capote would typically write for four hours during the day. He would then review and revise his writing that evening or the following morning. After he finished editing his work, he would type it — you guessed it — in bed, balancing the typewriter on his knees. Capote was also very superstitious — he would never begin or end a writing project on a Friday.
For further reading: Daily Rituals: How Artists Work by Mason Currey (2013)