Rock-a-bye baby, on the treetop,
When the wind blows, the cradle will rock,
When the bough breaks, the cradle will fall,
And down will come baby, cradle and all.
Tempting though it is, to upload an audio file of me singing this, the whole point of a lullaby is to send a little person off into a peaceful slumber, not bring on nightmares. Well, at least that's what I thought, until I read otherwise. Apparently one of the earliest lullabies on record - some 4000 years old - actually warns the baby against crying and disturbing the house god. Basically, baby needs to stop making a noise or risk being eaten by demons. It gets worse. A lullaby sung by the Luo people of Kenya warns that a crying baby may get eaten by hyenas!
Of course, there are psychological, cultural, and - wait for it - archaeomusicological explanations as to why some lullabies have a dark side. You can read more, here.
Me? I'll settle for Natalie Merchant singing me off into the Land of Nod, thank you.