The science of sleep
Media playback is unsupported on your device

Didn't get much sleep last night?

What happens to your brain power when tired?

This video has been optimised for mobile viewing on the BBC News app. The BBC News app is available from the Apple App Store for iPhone and Google Play Store for Android.

  • 27 Jun 2017
  • From the section Health
Go to next video: Are you getting enough sleep?