4. Turn on a humidifier A barrier repair moisturizer (containing ingredients such as ceramides and cholesterol) combined with an air humidifier in your bedroom produces durably hydrated, plump skin which is more resistant to irritants and allergens but also to appearing dry and fine-lined. By working on your skin’s hydration overnight, you can skip daytime moisturizer altogether or choose one that’s lighter since heavier moisturizers don’t tend to wear as well under sunscreen or makeup.