Why is sleep so important for the mind and body?
Sleep affects almost every aspect of our physiology, says Michael Timothy Smith, MA, PhD, director of the Behavioral Sleep Medicine Program at Johns Hopkins University. Watch this HealthMakers video to learn how the body "tunes up" during sleep.
Up Next
How many hours is considered enough sleep?
Can you catch up on sleep?
How does sleep affect chronic pain?
What happens to memory during sleep?
What is considered a good night's sleep?
How important is light for sleep-wake cycles?
What are good bedtime rituals to prepare for sleep?
What are the functions of REM sleep?
Does alcohol interfere with sleep?
Why do so many people have trouble sleeping?
