There's nothing easy about hosting a sleepover. Between whipping up snacks, providing entertainment, and getting a group of kids to bed, it can be an exhausting night for parents. So why not put the task in someone else's hands? There are many museums throughout the country that let kids young and old sleep among the exhibits, whether it's for a one-of-a-kind birthday bash or a special family weekend. Check out these 21 museums and plan an evening that your child will never forget.