As the world goes dark, this master switch tells our pineal gland to increase levels of the hormone melatonin in the bloodstream, sort of like a chemical lullaby.
Mother, dear mother, the years have been long Since I last listened your lullaby song; Sing, then, and unto my soul it shall seem Womanhood's years have been only a dream!
A study in the United States has found that playing Mozart's lullaby to newborn babies can reduce the pain they experience while undergoing a heel prick blood test.
Across countries and cultures, for instance, lullabies tend to share similar acoustic features that imbue infants and adults alike with a sense of safety.