One source of that is Robert M. Hutchins ("When I feel like exercising I just lie down until the feeling goes away.") I think I've read it in the context of an earlier writer, Twain or maybe Wilde, as you guessed. In the context of good deeds or inspiration to do something new. This is one that I may have read somewhere in context, so I will mull over the essays and novels I've read and maybe it will come to me. I'll lie down and think about it. . .

SRS