Every status update you read on Facebook, every tweet or text message you get from a friend, is competing for resources in your brain with important things like whether to put your savings in stocks or bonds, where you left your passport, or how best to reconcile with a close friend you just had an argument with.

That daydreaming mode turns out to be restorative. It's like hitting the reset button in your brain. And you don't get in that daydreaming mode typically by texting and Facebooking. You get in it by disengaging.

Neurons are living cells with a metabolism. And they need glucose in order to function. Glucose is the fuel of the brain, just like gasoline is the fuel of your car.

Daniel Levitin Quotes