The article discusses various reports published within the issue including one by Beate Pesch and colleagues on the correlation between long-term night work and increase risk of breast cancer, one by Yasushi Suwazono and team on the effects of shift work which reveal five percent increase in blood cholesterol levels in Japanese workers aged 21 years old and above, and one by Anders Knutsson and Henrik Bøggild on the correlation of shift work on peptic ulcer diseases.