Lullabies are soothing, grotesque and universal. In this episode of Stuff to Blow Your Mind, Robert and Julie explore the surprisingly rich world of human sleep songs.
Learn more about advertising on the HowStuffWorks podcasts at www.howstuffworks.com/advertisers.htm
And to learn about your ad choices when listening to podcasts, visit
https://www.howstuffworks.com/privacy.htm#ad-choices
