Why is there a red triangle on the package if Circadin® doesn’t cause a next-day residual sedative effect, e.g., it has no effect on vigilance, etc?

In some countries, the red triangle is a regulatory requirement to be put on the labeling of all sleep medicines as a warning that the drug should not be used while the patient is driving a car, or using other machinery, because of its sedative effects⁴⁸.