Everybody needs light in their life, but there are times when instead of letting the sunshine in, we want to keep it out. A good set of blackout drapes can prolong nighttime lighting when you want to sleep in or darken things up for a daytime nap. Work nights or swing shift? Blackout drapes are a lifesaver. Before buying, be sure to measure the width of the window to determine what size drapes you’ll need. Here’s what else to consider.