I bought black out shades and curtains for all the bedrooms and I ensure that they are drawn before bedtime. Our children do not have televisions in their rooms and do most of their playing in our den. Their bedrooms are used for quiet time and rest. The TUPPLUR black out roller blinds from IKEA is also cordless for increased child safety.
Love the plastered poster wall -- meant to mimic the subways in NYC that get covered with layers and layers of posters and become a sort of archaeological experience if you were ever to cut into it.