What is melatonin -- and should you take it to fall asleep? | Matt Walker
What is melatonin -- and should you take it to fall asleep? | Matt Walker

Melatonin is the hormone that tells our brains and bodies it's time to sleep.

But if you think melatonin supplements will significantly improve your ability to fall asleep and stay asleep, you may have been misled.

Sleep scientist Matt Walker shares how this "hormone of darkness" really works.