Sleep is not wasted time

While you sleep, your body repairs tissue, your brain sorts and stores what you learned during the day, and your hormones reset for the morning.

Cutting sleep short for just a few nights affects appetite, blood sugar and mood. Many people notice it first as cravings or a short temper, before they feel tired.

If you want to change one thing this week, protect your bedtime. Your wake-up time is often set for you. Your bedtime usually is not.