sleep

You'll understand sleep as a reversible state of reduced consciousness and learn why your body needs it to survive and thrive.

You'll discover how your body's internal clock regulates when you feel alert or sleepy throughout the 24-hour day.

You'll learn the two main sleep types and what your brain does during each stage—from light sleep to deep dreaming.

You'll understand how adenosine builds up during wakefulness to create sleep pressure, and how orexin neurons keep you awake when needed.