If the occasion is important enough, you will find the time. Self-nurturing is often forgotten when we have small children. It is extremely important to make time for yourself. Even if it is just 20 minutes in the tub while your husband entertains the children, it will help you. Also, though my children and I aren 't on graveyard shift, I do stay up a little later in the evening and take a nap with my daughter during the day.
Exercise is important as well.
Take the children for a walk, or find some walking buddies. Everyone must learn to be flexible and guard his or her positive attitudes. Periodically, stop and reassess family and individual needs. You will find that needs shift and change. Take turns at household responsibilities.