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1. Circadian Rhythm

   The body’s circadian rhythms determine when we feel sleepy and when we’re ready to be active. Learn how to harness the power of your circadian rhythms....

2. Circadian Rhythm Sleep Disorder

   Circadian rhythm sleep disorders occur when your sleep cycle is out of sync with your environment. Learn about these conditions and how they are treated....

3. How to Wake Up Early

   Waking up early can be a challenge. Several strategies can help you adjust your sleep schedule, wake up earlier, and feel alert in the...

4. Jet Lag and Sleep

   Jet lag doesn’t have to ruin your trip. Learn about the causes and symptoms of jet lag and how to realign your body’s internal clock to conquer jet...

5. Is Jet Lag Worse Traveling East to West?

   Jet lag can throw off your daily rhythms when you cross time zones. How much you're affected by jet lag might depend on which direction you travel....

6. How Sleep Works: Understanding Your Sleep Cycle

   Sleep is critical to all aspects of health. But how does it work? Learn what happens to your body when you sleep, why sleep is important, and...

7. Sleep Disorders: An Overview

   Sleep disorders affect a person’s ability to get consistent, quality sleep. Learn more about sleep disorders, including common causes, symptoms, and...

8. Non-24 Hour Sleep Wake Disorder: Causes, Symptoms, and Treatment

   Non-24-hour sleep-wake disorder causes insomnia and daytime drowsiness. We discuss the symptoms and treatments for this circadian rhythm disorder....

9. Shift Work Sleep Disorder

   Shift work sleep disorder can make it difficult for many workers to get the rest they need. Check out my tips on how to sleep well, even when you work...

10. What Is Sleep? Why, When, and How Our Bodies Rest

    Sleep is a vital and mysterious phenomenon that is critical to mental and physical health. Learn about the basics of sleep and tips for getting better...