Writing in bed: I have always loved Edith Wharton's habit of doing just that, as well as Cynthia Ozick's discussion of it (look how neat the desk at which Wharton is photographed in her stays; imagine how much more comfortable she is in bed with her stays undone). I remember learning, during my first studies of philosophy at Bryn Mawr, that René Descartes wrote in bed, by the heat of a stove supplied by Queen Christina, to say nothing of Winston Churchill's similar custom.