A night cream is typically formulated to be richer and more hydrating than a day cream to provide deeper moisturization overnight when the skin is in repair mode. Night creams often contain ingredients that promote cell turnover, collagen production, and repair skin damage caused during the day. Day creams, on the other hand, are usually lighter in texture and may contain SPF to protect the skin from sun damage. They are designed to provide hydration and protection during the day without feeling heavy or greasy under makeup.