If you have a small child that just won't fall asleep, scientists have found a way that doesn't resort to making them count sheep.
Analyzing the features of 4,500 songs, researchers in the Music and Science Lab at Durham University created the formula for the "perfect lullaby".
In what isn't the best news for Bono and company, U2's monster hit "One" checks all the boxes.
Of course, it’s probably a good idea to make sure the child is too young to understand the lyrics since The Edge admits it's a "bitter, twisted, vitriolic conversation between two people who've been through some nasty, heavy stuff".
When you can't fall asleep, what do you do?