Your body needs enough rest to recharge and maintain peak condition. Most of us aren't getting adequate sleep. When you lose sleep, it's so much easier to become irritated and let things get to you.
A "power nap" is perfect for getting your rest quickly, especially if you have a busy schedule. Instead of lying in bed and taking a full nap, try closing your eyes in a quiet room for about 15 to 20 minutes. A shorter nap can often be more effective and provide a greater boost of energy to help you sail through your remaining tasks.