She added the findings did not suggest that anyone made up having the condition as it was a biological process.

In their bodies, the healthy, helpful biological process works overtime.

The device uses a biological process called cell rolling, where cells get attracted to vessel walls and roll slowly across them in order to pick up instructions from nearby tissues.

Experiments such as these have helped us to redefine ageing not as something inevitable, but as a biological process that, like other biological processes, can be understood and remedied.

Researchers say sleep can rescue memories in a biological process of storing and consolidating them deep in the brain's complex circuitry.