Just as important as getting enough sleep is thinking about sleep in the right way. Stop thinking of sleep and naps as downtime or as a waste of time. Think of them as opportunities for memory consolidation and enhancing the brain circuits that help skill learning. Nor should you feel guilty about sleep. It's just as crucial a part of successful brain work as the actual task itself.

Think Smart: A Neuroscientist's Prescription for Improving Your Brain's Performance (ed. Penguin, 2009) - ISBN: 9781101050453