Gaby Roslin and Dr Amir Khan are joined by serial snorer Yvonne, and Craig, who suffers from night terrors. Plus, in-house sleep experts are keen to find out just how badly fatigue affects driving.

Carla suffers from Restless Leg Syndrome, while Peter has had chronic insomnia for 20 years. Plus the sleep deprivation experiment continues, testing for risky behaviour, pain resistance and emotional control.