The Willpower Instinct: How Self-Control Works, Why It Matters, and What You Can Do To Get More of It

by Kelly McGonigal

If you know you could use more sleep but you find yourself staying up late anyway, consider what you are saying “yes” to instead of sleep. This same willpower rule applies to any task you are avoiding or putting off—when you can’t find the will, you might need to find the won’t.