A new study into the effect of light exposure therapy, coupled with a steady sleep schedule and dark glasses, allows for increased alertness during night shifts and a decent sleep during days off. The study is published in the December edition of Sleep.

The number of people who work in our 24 hour society is increasing. Shift work has always been associated with doctors, nurses, pilots, and the police and emergency services. It also draws in people involved in catering, shop work, driving...