Dr Guy shines a light on this hidden world, revealing exactly what sleep does, how it works, and why it is as fundamental to our health as diet and exercise. We’ll take a look at biggest sleep cheat; caffeine.

Dr Guy unveils some shocking truths about the effects of not getting enough sleep. Meanwhile David investigates the grim history of sleep deprivation torture and meets the medical advisor to the TV show Shattered which offered £100k to the person who could stay awake the longest.

Dr Guy and David enter the weird world of sleepwalkers and people who act out their dreams, and also investigate the more devastating impact of chronic insomnia, night terrors and hypersomniacs who can fall asleep at any second.

Dr Guy delves into one of the most bizarre and mysterious parts of our sleep experience to explain how and why we dream. Meanwhile, David investigates the phenomenon of lucid dreaming, and speaks to a teacher who thinks he can help David take a conscious part in controlling his dreams.

Dr Guy and David discuss the cutting-edge technology which claims to be able to transform the way we snooze, and speak to the Dutch inventor who wants us to all cuddle up to a sleep robot.

At the end of David’s journey – he returns to Dr Guy’s consulting office to discuss his new treatments, sleeping habits, and answer the question; is he getting to sleep any easier?