During the day Moisturizing is essential to combat the effects of the sun, wind, and environment. At night, topical formulas are far more efficient. Instead of expending energy to be on the offensive against environmental aggressors, skin cells concentrate on healing, repairing and replenishing themselves. Also, during certain hours of the night – skin loses moisture – so the extra hydration makes the skin even more receptive to moisturizers like the Advanced Face Lotion and the Anti-Aging Formula.