Deep conditioning your hair overnight, instead of just 15 minutes, provides the ultimate treatment. This differs from an overnight hair mask because the oil penetrates the strands and seals the cuticles down. Porous hair occurs when the cuticles open, allowing moisture in but quickly escaping, often leaving hair dry. Oiling your hair overnight helps seal the cuticles, allowing deeper conditioning beyond the outer layer. Leaving it on overnight maximizes absorption. Oiling your hair overnight can also enhance hair growth, reduce shedding, improve scalp health, add natural shine and lustre, prevent split ends, and make hair softer and more manageable.