"Cognitive shuffling is a mental exercise that involves focusing your mind on words that have no association with one another, as a way of signaling to your brain that it’s time to fall asleep. You start by taking a random word — “Lane,” for example. Then think of as many words as you can that begin with the same first letter, like such as “Lace, Light, Lemur, Linger.” Take a second or so to visualize each word. People naturally drift off and fall asleep when they, in this way, shed their minds of troubling thoughts keeping them awake."
