You should always wear sunscreen or sun cream, even if you'll be inside most of the day. It's the easiest and most effective way to prevent premature aging (and skin cancer!). Sunscreen should be your last step for a day-time routine both indoors and outdoors.
Night Cream unlike moisturisers, is formulated especially to make the most of the skin's "night time rhythm", in which it regenerates and repairs the day's damage. It should be your last step for a night-time routine.