0:00 / 6:45
What Lack of Sleep Does to the Teenage Brain
A TED-Ed talk by sleep researcher Wendy Troxel on why teens are so sleep-deprived — how much sleep they actually need, why their biological clocks shift, and how early school start times work against them.
How it works
- Press play to start the video.
- Videos 5 minutes or longer pause once or twice for a quick check. Get it right and you're on your way. If not, you'll see a friendly explanation and the video simply keeps going. Short videos skip the checks.
- At the end there's a 3-question test. Score 60% or more to complete the lesson, and 80% or more to master it. You can always watch again and try for a higher score.