nature
Nature is good even for the spiritual. With spiritual problems, nature can help. It's harder to be moral without sleep. Your soul is helped when you think more clearly, feel better, have a sense of humor, and are well-rested. And after all, God made your soul and also nature, and they're supposed to compliment, work together. If you're a spiritual giant, then go ahead - fast for days, live in a cave, spend sleepless vigils, and isolate with God. And let no one stop you! That's not me, not yet. You could also get a pet.