The human body is designed to sleep at night and be awake during the day. Disrupting this “circadian” rhythm can cause everything from stress to heart disease and even cancer.

However, an experimental drug created by medical researchers has managed to synchronise blood cells in the body to effectively fool the body into thinking night is day and vice versa.

This could help millions who work nights, for instance, as well as business travellers who jet through time zones and need to change their sleep patterns to remain fresh for meetings.