Attachment follows the experience of pleasure. Aversion follows the experience of pain. Clinging to life is the sentiment which causes its own potency to flow equally even in the wise. Their operations are to be got rid of by meditation. Bengali Baba - Yogasutra of Patanjali

The Gita says: "Yoga is not for the person who eats a lot or for the one who starves. Yoga is not for the person who sleeps too much or for the one always keeping vigil". We shouldn't go to extremes, but should have limitations. The Yogasutra of Patanjali