Morning Skin Care Routine: It is OK to use more than one serum if you’re that into it. Just make sure you wait for a few minutes for the layer to be absorbed before applying the next. Also NO retinol during daytime. And sunscreen should be “broad spectrum” and SPF30+. Evening Skin Care Routine: In general, our skin is more open, and our body temp is slightly higher at night, which is why we get more benefits when we use quality skincare products at night.