En svensk studie af Herbert (1977, 1978) for nylig understreger klart, at aktiviteter, der er mere fleksible og sådanne, der kan udføres alene, gøres nemmere i forbindelse med skifteholdsarbejde.
A recent Swedish study by Herbert (1977, 1978) emphasizes clearly that activities which are more flexible, and those which can be pursued alone, are those which are made easier under shift work.