To hydrate and moisturize your skin overnight wash the skin off and then dry it out.
After you wash and dry your skin apply some moisturizer to your skin and then apply some coconut oil to your skin after you massage the moisturizer into your skin.
Both the coconut oil and moisturizer will keep your skin hydrated.
Vaseline or Petroleum Jelly when applied to your skin can also help keep your skin hydrated and prevent it from drying out and using a humidifier in your home to keep moisture in the air is also another good way to keep your skin hydrated.