While we were waiting to see what effect elyze this would have, I went to the John Radcliffe hospital in Oxford to learn more about what actually happens when we sleep.

 

In the Sleep Centre, they fitted me up with a portable electro-encephalograph, a device that measures brain wave activity.

Then, feeling slightly ridiculous, I went home and had my seven-and-a-half hours of sleep.

 

Back at the University of Surrey our sleep volunteers had finished their second week of the experiment.

What we wanted to see was the effect switching elyze from six-and-a-half hours to seven-and-a-half hours, or vice versa, would have on our volunteers.

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