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Why are you more likely to have a heart attack at eight o'clock in the morning or crash your car on the motorway at two o'clock in the afternoon? Can taking your medication at the right time of day really save your life? And have you ever wondered why teenagers will not get out of bed in the morning? The answers to these questions lie in the secret world of the biological clock.

Other episodes for this season

Why Are Thin People Not Fat?
Episode 1 - Why Are Thin People Not F...
Cannabis: The Evil Weed?
Episode 2 - Cannabis: The Evil Weed?
Why Do We Dream?
Episode 3 - Why Do We Dream?
Can We Make a Star on Earth?
Episode 4 - Can We Make a Star on Ear...
The Secret Life of Your Bodyclock
Episode 5 - The Secret Life of Your Bodyclock
What's the Problem with Nudity?
Episode 6 - What's the Problem with N...
How to Survive a Disaster
Episode 7 - How to Survive a Disaster
Who Do You Want Your Child to Be?
Episode 8 - Who Do You Want Your Chil...
Why Can't We Predict Earthquakes?
Episode 9 - Why Can't We Predict Eart...
Alan and Marcus Go Forth and Multiply
Episode 10 - Alan and Marcus Go Forth...
How Violent Are You?
Episode 11 - How Violent Are You?