• The Spirits' Book

    • Book Two - The Spirit World

      • Chapter VIII - Emancipation of the Soul

        • Sleep and Dreams

412. Do spirit activities when the body is sleeping or resting fatigue the body?

“Yes, because the spirit is attached to the body, like a balloon tied to a post. As the post is shaken by the movements of the balloon, the activity of the spirit reacts upon the body, and may cause it to feel tired.”

Source: Kardecpedia