"Dr Kurt Krauchi and his team at the Sleep Laboratory in Basel monitored the body temperature and functions of a group of young, healthy men as they nodded off. In every case, they fell asleep immediately after a shift in blood flow to hands and feet.
"One of the simplest ways we can do this is by walking. It's often an underrated form of exercise but it’s actually one of the easiest ways to get more active, lose weight and become healthier.