The first stage should preferably be a health questionnaire, which should be drawn up with the help of a doctor or nurse who knows what the health effects of night time working are likely to be. If the answers to the questionnaire raise any doubts about the individual's fitness to work at nights, or suggest that his (or her) health may be suffering because of night time working, the employer must then offer that employee a free medical examination, and act on the findings if necessary. You have to take particular care with new and expectant mothers, and with 'young workers'. You cannot wait until a worker requests an assessment - you must offer one.
